Alton Brown's Onion Dip from Scratch: I have nothing against using manufactured mixes, but look, after the zombie apocalypse strikes, and the megamart shelves are stripped bare … what do we do then? T (Onion Dip Recipes)
In a large bowl combine half the cheese the other ingredients, pour it into the greased casserole dish. Top with remaining cup of Swiss cheese and cup cheddar cheese. Bake 350 for minutes or until the top is lightly browned and bubbly.