Heat oven to 375°F. Spray 15x10x1-inch pan with cooking spray.
In 10-inch skillet, cook sausage over medium-high heat until well browned. Drain. Add chili beans and cumin; mix well.
Place tortillas, overlapping, down one side of pan. Spoon sausage mixture down center of tortillas; sprinkle with 1 1/2 cups of the cheese. Roll tortillas over sausage mixture to create 1 large burrito, seam side down. Spoon taco sauce over burrito; sprinkle with remaining 1 cup cheese.
Bake 15 to 20 minutes or until hot. To serve, cut burrito into slices. Serve with sour cream.