2 eggs
1 teaspoon baking powder
1 cup butter, softened
1/2 cup white sugar
4 cups all-purpose flour
1 1/2 cups brown sugar
1 teaspoon vanilla extract
1/4 teaspoon salt
Preheat oven to 350 degrees F (175 degrees C). Grease muffin cups or line with paper muffin liners.
In a large bowl, beat eggs, baking powder, white sugar, brown sugar and vanilla until well blended. Stir flour into the egg mixture and mix with a pastry blender until just moist. Fold the remaining batter into the mixture in a single layer.
Bake in preheated oven for 40 minutes, or until a toothpick inserted into center of a muffin comes out clean. Cool on a wire rack. Cool completely on a wire rack.