Ingredients

• Cake:
• 1 (16.25 ounce) package white cake mix
• 1 cup milk
• 1/2 cup butter
• 3 large eggs
• 2 tablespoons pure vanilla extract
• Caramel Frosting:
• 1/2 cup butter
• 1/2 cup packed light brown sugar
• 1/2 cup packed dark brown sugar
• 1/4 cup milk
• 1 teaspoon pure vanilla extract
• 2 cups confectioners' sugar

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Instructions

1. Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan.
2. Blend cake mix, 1 cup milk, 1/2 cup butter, eggs, and 2 tablespoons vanilla extract in a blender until batter is smooth, about 3 minutes. Pour batter into the prepared pan.
3. Bake in the preheated oven until a toothpick inserted in the center of the cake comes out clean, about 30 minutes.
4. Heat 1/2 cup butter, light brown sugar, and dark brown sugar in a saucepan; bring to a boil. Add 1/4 cup milk and 1 teaspoon vanilla extract and return to a boil. Remove saucepan from heat and spoon confectioners' sugar, about 2 tablespoons at a time, into mixture using a wooden spoon, stirring after each addition until frosting is smooth. Spread frosting over cake.