Rhubarb Coffee Cake

A Mother’s Day classic from Grandma Norma’s recipe box–plant rhubarb once, bake this cake for the next 20 years.

Why This Recipe

Mother’s Day deserves a recipe with a story. Anyone can pick up a bakery cake. But there’s something about baking from a handwritten recipe card–one that your mom made, and her daughter asked you to put in a cookbook–that turns a simple coffee cake into something meaningful. This is the kind of baking that connects generations.

Perennial crops are the ultimate sustainability investment. Rhubarb is one of the few food plants you buy once and harvest for decades. Compare that to annual vegetables that need seeds, starts, soil amendments, and replanting every year. A single rhubarb crown costs $5-10 at a garden center and produces pounds of stalks every spring for 20+ years. That’s not a grocery expense–it’s a one-time investment that pays dividends every May for the rest of your life.

Homemade beats store-bought in every way that matters. A coffee cake from a bakery runs $15-25. This recipe serves 9-12 people using pantry staples and rhubarb from the backyard–total cost is a few dollars. It tastes better, it comes with a story, and there’s no plastic clamshell packaging heading to a landfill. Fifteen minutes of prep, thirty minutes in the oven, and you’ve got something worth celebrating over.

The Story

Some recipes live in cookbooks. The best ones live in recipe boxes–handwritten on stained index cards, tucked between clipped newspaper columns and church potluck favorites. This coffee cake comes from Grandma Norma’s recipe box, and it’s the kind of recipe that earns its place through decades of being made, requested, and made again.

My daughter Angie is the one who made sure this recipe would never get lost. Her exact words: “Mom, make sure that is in your cookbook!” When your kid specifically requests that a recipe survive in writing, you know it’s earned its spot. This is Angie’s favorite, and once you make it, you’ll understand why. The cake is soft and tender, the rhubarb adds a bright tartness that cuts through the sweetness, and that cinnamon streusel topping turns the whole thing into something that smells like a bakery and tastes like home.

With Mother’s Day coming up, this felt like the right time to share it. There’s something fitting about a recipe that connects three generations–Grandma Norma’s recipe box, my kitchen, Angie’s request to preserve it. If you’re looking for something to bake for the moms in your life, this is it. It’s impressive enough to feel special but simple enough that you won’t be stressed on a Sunday morning. And if you’re a mom making it for yourself? Good. You deserve warm coffee cake.

Here’s the sustainability angle that makes this recipe even better: rhubarb is a perennial. You plant it once and harvest it every spring for 20 years or more. No replanting, no buying starts, no annual seed expense. Our rhubarb patch in Wisconsin survives brutal winters without complaint and comes back stronger every year. A single rhubarb crown costs $5-10 at a garden center and produces pounds of stalks every season. That’s zero food miles, zero recurring cost, and a dessert ingredient that literally grows itself.

Key Details

Prep Time: 15 minutes | Cook Time: 30-35 minutes | Yield: 9-12 servings

Sustainability Note: Rhubarb is a perennial crop–plant it once and harvest for 20+ years with minimal care. It thrives in cold climates, requires no replanting, and produces abundantly from a small garden footprint. This recipe turns a zero-input, zero-food-mile ingredient into a cake that three generations of our family have loved.

The Recipe

Ingredients

Cake:

Streusel Topping:

Optional Glaze:

Instructions

1. Preheat oven to 350 degrees F. Grease a 9x13 inch baking pan.

2. Make the cake batter: In a large bowl, combine flour, sugar, baking powder, and salt. Add softened butter, eggs, milk, and vanilla. Mix until well combined.

   • If using GF flour: Let batter rest for 30 minutes before assembling.

3. Make the streusel topping: In a separate bowl, combine brown sugar, flour, and cinnamon. Cut in cold butter until the mixture is crumbly.

4. Assemble the cake: Pour batter into the prepared pan. Place sliced rhubarb on top of the batter. Sprinkle streusel topping evenly over the rhubarb.

5. Bake at 350 degrees F for 30-35 minutes. Test with a toothpick–it should come out clean.

6. Optional glaze: Mix powdered sugar, milk, and vanilla until smooth. Drizzle over warm or cooled cake.

Notes & Variations

• Rhubarb prep: Cut stalks into 1/2-inch slices. Remove and discard the leaves–they’re toxic. The stalks are the only part you want.
• How much rhubarb: “To taste” means enough to cover the batter in a single layer. For a 9x13 pan, that’s roughly 3-4 cups of sliced rhubarb. If you love rhubarb, go heavy–the tartness balances the sweet streusel beautifully.
• The glaze is optional: Our family preference is to skip it. The streusel topping provides plenty of sweetness on its own, and the rhubarb’s tartness shines through better without the extra sugar. But if you love a drizzle, go for it.
• Cinnamon: The source recipe says “we love cinnamon!” and so do I. Two heaping teaspoons is generous, and that’s the point.
• Apple version: This recipe also works beautifully with sliced apples instead of rhubarb–same base recipe, different seasonal fruit.

Gluten-Free Notes:

• TESTED - This recipe works beautifully with GF flour!
• Use Bob’s Red Mill Gluten-Free 1-to-1 Baking Flour (260g for cake, 65g for topping)
• Bob’s Red Mill 1-to-1 already contains xanthan gum–no need to add more
• Let batter rest 30 minutes before assembling (see step 2)
• May need an additional 5-10 minutes of baking time
• Test with a toothpick and trust your eyes–golden brown and clean toothpick means it’s done

Additional notes from our kitchen:

• Freezing rhubarb: When the garden produces more than we can use (and it will), I slice and freeze rhubarb in measured portions in freezer bags. That way it’s ready for this recipe any time of year–even in January when you’re craving a taste of spring.
• Fresh vs. frozen rhubarb: Both work. If using frozen, thaw it first and drain any excess liquid so the batter doesn’t get soggy.
• Butter temperature matters: Softened butter for the batter (room temperature, not melted), cold butter for the streusel. The cold butter is what creates those crumbly streusel pieces.
• Sharing the harvest: A mature rhubarb plant produces far more than one family can eat. Split your crown every few years and share divisions with neighbors. It’s the gift that keeps giving–literally for decades.
• Marked-down rhubarb: If you don’t grow your own, check farmers markets and grocery stores in late spring. Rhubarb is seasonal and often marked down when there’s a surplus.

Serving Suggestions

• Serve warm with a dollop of whipped cream
• Pair with coffee or tea for a Mother’s Day brunch
• Top with a spoonful of vanilla yogurt for a lighter option
• Great for breakfast, brunch, dessert, or an afternoon treat
• Bring to a potluck–the 9x13 pan travels well

Storage & Make-Ahead

• Room Temperature: Store covered at room temperature for up to 3 days
• Refrigerate: Keep up to 1 week in the fridge (warm slightly before serving for best flavor)
• Freeze: Wrap tightly or store in an airtight container. Freeze for up to 2 months. Thaw overnight in the fridge or warm in the oven at 300 degrees F for 10-15 minutes.
• Make-Ahead: This cake is best the day it’s made, but it reheats well. Bake the day before Mother’s Day and warm it in the morning for a stress-free brunch.

Links & References

• Source: Grandma Norma’s recipe box

Related Friday Food Posts:

• Grandma Seely’s Banana Muffins - Another family recipe that turns pantry staples into bakery-quality baking
• Fluffy Apple Oatmeal - Another breakfast that celebrates seasonal fruit

Coming Soon:

• Rhubarb Crisp - The other way we use the spring rhubarb harvest
• Strawberry-Rhubarb Jam - Preserve the spring harvest in a jar
• Apple Coffee Cake - The fall version of this same recipe with sliced apples

Print This Recipe

Rhubarb Coffee Cake Prep: 15 min | Cook: 30-35 min | Yield: 9-12 servings

Cake:

• 2 cups (260g GF) all-purpose flour
• 1 cup (200g GF) sugar
• 2 tsp baking powder
• Pinch salt
• 1/2 cup butter, softened
• 2 eggs
• 1 cup milk
• 1 tsp vanilla
• Sliced rhubarb (enough to cover batter, roughly 3-4 cups)

Streusel Topping:

• 1/2 cup (65g GF) all-purpose flour
• 1/2 cup (110g GF) brown sugar, packed
• 2 heaping tsp cinnamon
• 1/4 cup cold butter

Optional Glaze:

• 1 cup powdered sugar
• 2-3 tbsp milk
• 1/2 tsp vanilla

Instructions:

1. Preheat oven to 350 degrees F; grease a 9x13 pan
2. Combine flour, sugar, baking powder, and salt; add butter, eggs, milk, and vanilla; mix well
3. For GF: Let batter rest 30 minutes before assembling
4. For streusel: combine brown sugar, flour, and cinnamon; cut in cold butter until crumbly
5. Pour batter into pan; layer sliced rhubarb on top; sprinkle with streusel
6. Bake 30-35 minutes until toothpick comes out clean
7. Optional: drizzle with glaze (powdered sugar + milk + vanilla)
8. GF note: May need additional 5-10 minutes baking time

Storage: Room temp 3 days, refrigerate 1 week, freeze up to 2 months.

Some recipes are just food. This one is a conversation across generations–Grandma Norma’s recipe box, Angie’s favorite cake, and a spring harvest that comes back year after year. Happy Mother’s Day to the women who taught us that the best things in life are homemade.