Preheat oven to 400°F. Spray a 9x13" pan with nonstick cooking spray.
Stir together butter, cottage cheese, mozzarella cheese, flour, baking powder, Italian seasning, and salt. Whisk in eggs and and whisk until combined (mixture will be lumpy).
Pour into prepared pan and bake for 30-40 minutes or until browned and set in the middle. Cool 5-10 minutes before slicing and serving.
Best served fresh, but it can also be sliced and stored in individual containers and frozen. Defrost in microwave.