Preheat the oven to 425°F.

Flatten the refrigerator biscuits to about 3 1/2 inches wide.

Top biscuits with 1 teaspoon pizza sauce, a few sausage crumbles, a string cheese piece and a sprinkle of oregano.

Gather the edges up around the toppings and pinch together at the top.

Place the pizza balls into a greased pie pan with the seams on the bottom.

Brush the tops with a beaten egg white.

Sprinkle the tops with grated Parmesan cheese.

Bake at 425°F for about 15 minutes or until golden brown.

Serve with additional pizza sauce, if desired.