Place water and Krusteaz Professional Corn Muffin Mix in mixer bowl.
Using a paddle, mix on low speed 30 seconds. Scrape bowl. Add 10 oz (2 1/2 cups) cheddar cheese and cottage cheese. Continue to mix on low speed 30 seconds.
Using #20 scoop, fill prepared muffin pans. Sprinkle remaining cheddar cheese over batter.
For convection oven, bake at 350°F 14-16 minutes; for standard oven, bake at 400°F 16-18 minutes.
Immediately loosen muffins with knife. Remove from pan and cool completely.