Preheat oven to 350°F. In a large bowl of a stand mixer, using the wire whip attachment, beat eggs on high speed for 5 minutes or until thick, at least double the size, and egg mixture turns a lighter yellow color. Gradually add sugar, beating until mixture is light and fluffy (about 2-3 more minutes). Beat in vanilla.
Combine flour and baking powder in a small bowl. Gradually add to batter, beating at low speed until smooth.
In a small saucepan, heat milk and butter just until butter is melted. Gradually add to batter; beat on low speed, until just combined.
Pour into a greased 10-in. spring foam pan. Bake at 350° for 35-40 minutes or until a toothpick inserted near the center comes out clean. Cool completely before cutting and serving.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.