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Grandma’s Sweet Potato Butter Cake with Easy Glaze – A Classic Homemade Favorite Full of Flavor and Love

There’s a reason Grandma’s recipes always taste better — they’re made with love, patience, and a touch of nostalgia. Grandma’s Sweet Potato Butter Cake with Easy Glaze is one of those timeless treasures that warms your heart as much as it delights your taste buds. This cake is pure comfort: rich, buttery, and perfectly spiced with cinnamon and nutmeg. The sweet potatoes keep it moist, giving each slice a melt-in-your-mouth texture that’s irresistible. Then, a simple vanilla glaze drizzled over the top adds just the right amount of sweetness and shine. It’s the kind of cake that feels right at home on any occasion — from Sunday dinners to Thanksgiving feasts. The flavor is simple but elegant: buttery base, creamy sweet potato richness, and that cozy hint of spice that makes you close your eyes after the first bite. If you’ve never baked a sweet potato cake before, this is the perfect one to start with. It’s easy to make, incredibly forgiving, and guaranteed to bring that homemade warmth we all crave.
Print Recipe Pin Recipe
Prep Time 20 minutes
bake & Cooling/Glazing time 1 hour 20 minutes
Total Time 1 hour 40 minutes
Servings: 12 slices
Ingredients Equipment Method Notes

Ingredients
  

Fruits & Vegetables
  • 1 cup sweet potatoes cooked and mashed
Fresh Produce
  • 4 large eggs room temperature
Dry Ingredients
  • 2 cups all-purpose flour
  • 2 teaspoons baking powder
  • ½ teaspoon baking soda
  • 1 teaspoon ground cinnamon
  • ¼ teaspoon ground nutmeg
  • 1½ cups granulated sugar
  • ½ teaspoon salt
Dairy
  • 1¼ cups 280g unsalted butter, softened
  • ½ cup sour cream
  • ¼ cup whole or 2% milk
Other
  • 2½ teaspoons vanilla extract
For the Easy Vanilla Glaze
  • ½ cup powdered sugar sifted
  • 1 tablespoon milk
  • ½ teaspoon vanilla extract

✨ Kitchen Essentials You’ll Love

Quick picks I trust for better results, faster prep, and easier cleanup.

  • 🍳

    Lodge Seasoned Cast Iron Skillet

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  • ⚡

    Instant Pot Duo Plus 9-in-1 Electric

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  • 🔥

    CHEFMAN Digital Air Fryer XL 10L

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Disclosure: As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.

Equipment

  • Here’s what you’ll need to make this beautiful cake:
  • Mixing bowls (large and medium)
  • Hand mixer or stand mixer
  • Whisk
  • Rubber spatula or wooden spoon
  • Measuring cups and spoons
  • 9x5-inch loaf pan or 10-inch bundt pan
  • Cooling rack
  • Toothpick (for testing doneness)
  • Small bowl for glaze
  • Optional:
  • Sifter (for flour and powdered sugar)
  • Potato masher or food processor (for sweet potatoes)

Method
 

Step 1: Prepare the Sweet Potatoes
  1. Peel and cube your sweet potatoes.
  2. Boil in a pot of water until tender (about 15 minutes), or bake them at 400°F (200°C) for 45 minutes for a deeper flavor.
  3. Mash until smooth and let cool completely before using.
Step 2: Preheat the Oven
  1. Preheat your oven to 350°F (175°C).
  2. Grease and flour your cake pan (either a loaf or bundt pan) to prevent sticking.
Step 3: Mix the Dry Ingredients
  1. In a medium bowl, whisk together flour, baking powder, baking soda, cinnamon, nutmeg, and salt.
  2. Set aside — this helps keep the texture light and even.
Step 4: Cream the Butter and Sugar
  1. In a large mixing bowl, use a mixer to cream butter and granulated sugar together for about 3–4 minutes, until fluffy and pale.
  2. Scrape down the sides of the bowl as needed — this step builds air into your cake for that soft, tender crumb.
Step 5: Add the Eggs and Sweet Potatoes
  1. Beat in the eggs one at a time, mixing well after each addition.
  2. Add the mashed sweet potatoes and continue mixing until fully incorporated.
  3. Stir in vanilla extract.
Step 6: Combine Wet and Dry Ingredients
  1. Gradually add the dry ingredients into the butter mixture, alternating with sour cream and milk.
  2. Begin and end with the dry ingredients for best results.
  3. Mix just until combined — don’t overmix or the cake may become dense.
Step 7: Bake
  1. Pour the batter into the prepared pan and smooth the top with a spatula.
  2. Bake for 55–65 minutes (bundt pan) or 50–55 minutes (loaf pan), until a toothpick inserted into the center comes out clean.
  3. Let cool in the pan for 10–15 minutes, then transfer to a cooling rack to cool completely before glazing.
Step 8: Make the Easy Glaze
  1. In a small bowl, whisk together powdered sugar, milk, and vanilla extract until smooth.
  2. If the glaze is too thick, add a few drops more milk; if too thin, add a bit more sugar.
  3. Drizzle over the cooled cake in smooth ribbons, letting it drip naturally down the sides.
Step 9: Serve and Enjoy
  1. Slice thick, moist pieces of this buttery sweet potato cake, and serve with coffee, tea, or a glass of milk. The soft crumb, rich flavor, and sweet vanilla glaze make it simply irresistible.

Notes

🧊 Storage & Reheating
Room Temperature
Store the glazed cake covered for up to 2 days.
Refrigeration
Keep refrigerated in an airtight container for up to 7 days.
Bring to room temperature before serving for the best texture.
Freezing
Freeze unglazed cake for up to 3 months.
Wrap tightly in plastic wrap, then foil.
Thaw overnight and glaze before serving.
Reheating
For a warm, just-baked taste, heat slices in the microwave for 10–15 seconds.
🥄 Variations
Pecan-Topped Sweet Potato Cake: Add ½ cup chopped pecans to the batter or sprinkle over the glaze for a nutty crunch.
Spiced Holiday Version: Add ¼ teaspoon ground ginger or allspice for a festive twist.
Coconut Glaze: Replace milk in the glaze with coconut milk and top with toasted coconut flakes.
Cream Cheese Frosting Option: Swap the glaze for a tangy cream cheese frosting if you prefer a richer topping.
Mini Loaves: Pour batter into mini loaf pans for adorable gift-sized treats.
Vegan Version: Substitute butter with plant-based butter, eggs with flaxseed eggs, and sour cream with coconut yogurt.
❓ 10 FAQs
1. Can I use canned sweet potato purée?
Yes — just ensure it’s 100% pure sweet potato, not pie filling.
2. Can I make this cake ahead of time?
Absolutely! It tastes even better the next day as the flavors deepen.
3. What makes this cake so moist?
The combination of sweet potatoes, butter, and sour cream keeps it rich and tender.
4. Can I reduce the sugar?
Yes, reduce to 1¼ cups for a less-sweet version without affecting the texture.
5. Can I use buttermilk instead of milk?
Yes, it adds a subtle tang that enhances the cake’s flavor.
6. How do I know when the cake is done?
A toothpick inserted in the center should come out clean, and the top should be golden.
7. Can I make it gluten-free?
Yes, use a 1:1 gluten-free baking flour blend for best results.
8. What’s the best way to mash sweet potatoes?
Use a fork for a rustic texture or a hand mixer for perfectly smooth mash.
9. How thick should the glaze be?
It should be pourable but not runny — like a ribbon that sets as it cools.
10. Can I serve this cake warm?
Yes! It’s wonderful slightly warm with a bit of butter or whipped cream.
🏁 Conclusion
Grandma’s Sweet Potato Butter Cake with Easy Glaze is the kind of dessert that reminds you what real homemade baking is all about — simple ingredients, pure flavors, and lots of love.
The sweet potatoes add a natural richness, the butter gives it that melt-in-your-mouth crumb, and the vanilla glaze ties everything together with sweetness and shine. It’s the perfect balance of nostalgic comfort and timeless flavor.
Whether you’re baking it for the holidays or as a treat for your family, this cake will fill your kitchen with the irresistible scent of butter, spice, and sweetness — just like Grandma used to make.
Bake it once, and it’ll become a recipe you return to again and again — a true family heirloom in cake form.