Preheat oven to 350°F. Brown ground meat in a heavy nonstick skillet over medium high heat. Drain excess drippings. Combine meat with onion and 1 cup cheddar cheese. Slightly warm tortillas according to package directions to soften. Put some filling down the middle of each tortilla and roll up. Place enchiladas in a 9x13 inch baking dish. Combine soups and salsa in a bowl. Pour over enchiladas and spread evenly. Sprinkle with remaining cheese. Bake about 20 minutes or until heated through, bubbly and cheese has melted.