Step 1 – Prepare the Cake:
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Preheat oven to 350°F (175°C). Grease a 9×13-inch baking pan with 1 tablespoon of oil or line with parchment paper.
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In a large bowl, whisk together flour, brown sugar, granulated sugar, cocoa powder, baking powder, baking soda, and salt.
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In another bowl, whisk eggs, milk, sour cream, 1 cup oil, and vanilla extract until smooth.
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Pour wet ingredients into dry ingredients and stir until just combined (do not overmix).
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Spread batter evenly into the prepared pan.
Step 2 – Bake:
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Bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean.
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Immediately sprinkle mini marshmallows evenly over the hot cake. Return to oven for 2–3 minutes, just until marshmallows puff and soften. Remove and let cool slightly.
Step 3 – Make the Frosting:
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In a medium saucepan, melt butter over medium heat. Stir in milk, cocoa powder, vanilla, and salt.
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Whisk until smooth, then gradually beat in powdered sugar until thick and glossy.
Step 4 – Finish:
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Pour warm frosting over the marshmallow layer, spreading gently to cover.
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Let cake cool completely before slicing into squares.
🍽 Tips & Variations:
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