One-Bowl Moist Vanilla Butter Cake with Melted Butter

By AislePrompt Editorial · Published 2026-06-05 · Updated 2026-06-05

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are drafted and published.

A simple, moist vanilla cake made in one bowl using melted butter and oil for extra tenderness, perfect for any occasion. This American-inspired recipe, ready in about 50 minutes, layers all-purpose flour, cornstarch, baking powder into a dessert worth slowing down for — great for weekend baking, holiday tables, or any time you want a sweet payoff at the end of a meal. Each serving lands at about 350 calories and feeds 12, so it slots into a weekend bake or a special-occasion dessert tray. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 40 min Serves 12 American cuisine 350 cal/serving

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Ingredients

2 1/4 cups all-purpose flour
2 tbsp cornstarch
2 1/2 tsp baking powder
1/2 tsp baking soda
1/2 tsp salt
1/2 cup unsalted butter, melted
1/4 cup vegetable oil
1 3/4 cups granulated sugar
3 large eggs
1 cup whole milk
2 tsp pure vanilla extract

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Instructions

Step 1: Preheat oven to 350°F. In a large bowl, sift together 2 1/4 cups all-purpose flour, 2 tbsp cornstarch, 2 1/2 tsp baking powder, 1/2 tsp baking soda, and 1/2 tsp salt.
Step 2: Add 1/2 cup melted unsalted butter, 1/4 cup vegetable oil, 1 3/4 cups granulated sugar, 3 large eggs, 1 cup whole milk, and 2 tsp pure vanilla extract to the dry ingredients. Using a hand mixer or whisk, beat everything together on medium speed for about 2 minutes until smooth and well combined.
Step 3: Pour the batter evenly into a greased 9x13-inch baking pan and smooth the top with a spatula.
Step 4: Bake in the preheated oven for 35-40 minutes, or until a toothpick inserted into the center comes out clean and the top is lightly golden.
Step 5: Remove the cake from the oven and allow it to cool for at least 20 minutes before slicing and serving.