**Preheat your oven** according to the cake mix package directions. Typically, this will be around 350°F (175°C). Grease and flour your cake pans.
**Prepare the batter**:
- In a large bowl, combine the cake mix, milk (instead of water), melted butter (instead of oil), and eggs.
- Add 1 teaspoon of vanilla extract for added depth of flavor.
- Mix on low speed for 30 seconds, then increase to medium speed and beat for 2 minutes until the batter is smooth and well combined.
**Bake**: Pour the batter into the prepared cake pans. Bake according to the times listed on the cake mix package, usually around 25-30 minutes, or until a toothpick inserted into the center comes out clean.
**Cool**: Let the cakes cool in the pans for 10 minutes, then turn them out onto a wire rack to cool completely.