Remove bacon from skillet; drain on paper towels. Discard all but 2 Tbsp. drippings from skillet.
Add onions to reserved drippings; cook and stir on medium heat 3 to 5 min. or until crisp-tender. Spoon into 1-1/2-qt. casserole sprayed with cooking spray.
Crumble bacon.
Add to onions in casserole along with remaining ingredients; mix well. Cover.