Heat oven to 375°F. In 10-inch skillet, cook sausage, bell pepper and onion over medium-high heat, stirring frequently, until sausage is no longer pink and vegetables are tender; drain. Stir in 3 tablespoons of the pizza sauce.
If using crescent rolls: Unroll both cans of dough; separate into 8 rectangles. Firmly press perforations to seal. If using dough sheets: Unroll both cans of dough; cut into total of 8 rectangles.
Place about 1/4 cup sausage mixture and folded 1/2 slice of cheese on one end of each rectangle. Fold dough in half over filling; press edges with fork to seal. Place on ungreased cookie sheet.
Bake 15 to 18 minutes or until golden brown. Meanwhile, heat remaining pizza sauce. Immediately remove sandwiches from cookie sheet. Serve warm with warm pizza sauce.