Preheat oven to 400°.
Place cottage cheese in a food processor; process 1 minute or until smooth. Combine cottage cheese, Monterey Jack cheese, onion, and salt, stirring well.
Spread 1/4 cup Red Chile Sauce in bottom of an 8 x 8-inch baking dish coated with cooking spray. Arrange 4 tortillas over sauce, overlapping slightly. Spread 1/2 cup cottage cheese mixture evenly over tortillas; top with 1/2 cup Red Chile Sauce. Repeat the layers once with 4 tortillas, remaining cottage cheese mixture, and 1/2 cup Red Chile Sauce. Arrange remaining 4 tortillas over sauce, overlapping slightly; spoon remaining 3/4 cup Red Chile Sauce over tortillas. Sprinkle evenly with cheddar cheese. Cover and bake at 400° for 10 minutes. Uncover and bake an additional 10 minutes or until cheese melts. Let stand 5 minutes. Cut into 8 squares.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.