Cook and stir vegetables in medium skillet sprayed with cooking spray on medium heat 10 min. or until crisp-tender.
Spread bread onto bottom of 13x9-inch baking dish sprayed with cooking spray; top with vegetables. Whisk eggs and sour cream until well blended; pour over vegetables. Top with VELVEETA.
Bake 40 min. or until center is set and casserole is heated through.
Notes
Make ahead: Casserole can be assembled ahead of time. Refrigerate up to 24 hours before baking as directed, increasing the baking time if needed until casserole is done.
Size-wise: Looking for something to serve as part of your next brunch menu? This satisfying casserole is sure to please since it makes enough for 12 servings.
Keeping it safe: Always serve egg-based dishes immediately after cooking to prevent bacterial growth. Be sure to cook until the eggs are completely set. Avoid recipes which call for partially cooked or raw eggs.