S'mores Brownies

Name: S'mores Brownies
Prep time: 30 min
Cook time: 45 min
Total time: 1 h 15 min
Cuisine: American
Ingredients: 1.5 packages graham crackers (~2 cups crumbs or a half a box); 1 stick salted melted butter (113 g); ¼ cup granulated ugar (50 g); 1 batch of 9x13 brownies (our recipe is below or even a box mix will work!); 4 egg whites; 1 cup sugar (200 g); ¼ teaspoon cream of tartar; 1 teaspoon vanilla or 1 tablespoon vanilla bean paste