Cake Layers:

• 9 Tbsp unsalted butter, at room temperature
• 1 cup sugar
• zest of 1 lemon
• 3 large eggs, separated
• 1 tsp vanilla extract
• 2 cups all purpose flour
• 2 tsp baking powder
• 1 tsp salt
• 1/2 tsp baking soda
• 1 cup plain greek yogurt (you can use vanilla yogurt as well)
• 1 1/2 cups raspberries (frozen berries)

Frosting:

• 1 cup unsalted butter, at room temperature
• 5 cups confectioner’s sugar, sifted
• 4 Tbsp fresh lemon juice, you may need a bit more
• optional: 1 small drop yellow gel food coloring