Pizza Supreme

prep time: 10 minutes, plus 1 hour to chill dough, if needed cook
time: 15 minutes yield: 4 servings

crust

1¾ cups shredded mozzarella cheese
2 tablespoons unsalted butter
1 large egg, beaten
¾ cup blanched almond flour
⅛ teaspoon fine sea salt

toppings

¼ pound ground beef
1 teaspoon fine sea salt
1 cup pizza sauce, homemade (here) or store-bought
½ cup shredded mozzarella cheese
¼ cup sliced black olives
¼ cup chopped or sliced green bell peppers
¼ cup chopped or sliced red bell peppers
½ cup sliced button mushrooms
¼ cup pepperoni slices
1 (⅛-inch-thick) slice red onion, rings separated