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Keto Vanilla Butter Cake - A Simple, Comforting Low-Carb Treat

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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 12 servings
Ingredients Method

Ingredients
  

  • Almond flour (2 cups, finely ground, blanched works best)
  • Coconut flour (2 tablespoons for structure)
  • Baking powder (2 teaspoons, aluminum-free if possible)
  • Salt (1/4 teaspoon)
  • Unsalted butter (1/2 cup, softened; plus a little for greasing)
  • Granulated keto sweetener (2/3 to 3/4 cup, allulose or erythritol blend)
  • Eggs (4 large, room temperature)
  • Full-fat sour cream (1/2 cup; Greek yogurt works in a pinch)
  • Vanilla extract (2 teaspoons; add 1/2 teaspoon vanilla bean paste if you have it)
  • Heavy cream (2 tablespoons, for extra moisture)
  • Lemon zest (optional, 1/2 teaspoon, brightens the vanilla)

Method
 

  1. Prep the pan: Heat oven to 325°F (163°C). Grease your pan and line the bottom with parchment. This prevents sticking and gives clean slices.
  2. Mix the dry ingredients: In a medium bowl, whisk almond flour, coconut flour, baking powder, and salt to break up clumps and evenly distribute the leavening.
  3. Cream the butter and sweetener: In a large bowl, beat softened butter with the sweetener for 2–3 minutes until light and slightly fluffy. This traps air and helps lift the cake.
  4. Add eggs slowly: Beat in eggs one at a time, mixing well after each addition. Scrape the bowl so everything combines smoothly.
  5. Stir in flavor and moisture: Add vanilla, sour cream, heavy cream, and optional lemon zest. Mix until just combined. The batter should look creamy, not runny.
  6. Combine wet and dry: Add the dry ingredients to the wet mixture. Mix on low until smooth and thick. Let it sit 1–2 minutes to hydrate the coconut flour.
  7. Fill the pan: Spread the batter evenly into your prepared pan, smoothing the top. Tap the pan once on the counter to settle air pockets.
  8. Bake: Bake 35–45 minutes for an 8-inch round (45–55 for a loaf), until the top is golden and a toothpick comes out mostly clean with a few moist crumbs. If browning too fast, tent with foil.
  9. Cool properly: Let the cake cool in the pan for 15 minutes, then lift out using the parchment and cool completely on a rack. This sets the crumb and prevents crumbling.
  10. Serve: Slice and enjoy plain, with a dollop of lightly sweetened whipped cream, or with fresh berries. A dusting of powdered keto sweetener is a nice touch.