Apple Crisp Pizza

Ingredients:

1 dough for a single-crust pie

2/3 cup sugar

3 tablespoons all-purpose flour

1 teaspoon ground cinnamon

4 medium baking apples, peeled and cut into 1/2-inch slices

Topping:

1/2 cup all-purpose flour

1/3 cup packed brown sugar

1/3 cup rolled oats

1 teaspoon ground cinnamon

1/4 cup butter, softened

1/4 to 1/2 cup caramel ice cream topping or caramel apple dip

Vanilla ice cream, optional