Brown beef, adding onion about half way through
Add corn, soup, ketchup and seasoning to the beef
Cook noodles (al dente), drain and mix in with other ingredients
Put everything into a resealable bag, remove excess air, and seal
Grate cheese and seal in a bag, then staple it to the top of the other bag
Carefully remove staples and thaw ingredients
Pour casserole into an oven-safe dish and sprinkle cheese on top
Bake at 350 for 45-50 minutes, covered
Uncover for the last 10 minutes of cooking
I prefer Tinkyada past to other brands of gluten-free varieties.
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