50min · 12 servings Ingredients Cake • 9 Tbsp unsalted butter, at room temperature • 1 cup granulated 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 (I like to use frozen berries) Lemon buttercream • 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