If you're an onion lover, this one's for you. This dish is one that always receives compliments, even from people who claim they don't enjoy onions. It is a perfect accompaniment to any meat and has been gracing our holiday table for many, many years now. Cheesy and comforting. What more can you ask for?
At this point, add 1 T. sugar and allow to melt and form a syrup in the sauteed onions. To thicken the sauce, add 2-3 T. all purpose flour and stir into the onion mixture. Cook for an additional few minutes and then remove from heat.
Pour onion and cheese mixture into a greased casserole dish. Top entire mixture with 1 C. Panko crumbs and drizzle 1 T. melted butter over top. Bake for 35 minutes until cheese is bubbly around the sides and the panko crumbs are browned. So good and so comforting!!!