Assemble - In a casserole dish, spread ½ cup chili gravy evenly across the bottom. Place ¼ cup cheese and 1 tbsp diced onion across the center of 1 tortilla. Roll it up and place in the baking dish seam side down. Repeat. Pour remaining chili gravy over rolled tortillas and cover with remaining cheese and onion.
2 cups Tex-Mex chili gravy (Sub: store bought enchilada sauce), 4 cup Shredded yellow cheddar cheese (Sub: white cheddar, Monterey Jack or Colby cheese), 1 medium White onion, diced