01 - Preheat oven to 350°F. In a bowl, combine graham cracker crumbs, melted butter, and sugar until evenly moistened. Press mixture firmly into an ungreased 9x9 inch baking pan.
02 - Bake the crust for 10 minutes until lightly golden. Remove from oven and set aside.
03 - In a medium bowl, stir together chopped spinach, ricotta, Parmesan, eggs, garlic powder, salt, and pepper until well combined.
04 - Pour filling over the pre-baked crust and spread evenly. Return to oven and bake an additional 25 minutes until set and edges are golden.
05 - Allow bars to cool completely in the pan before slicing into squares and serving.