Saute crumbled sausage mushrooms onions salt and pepper Drain well on paper towels Combine eggs and sour cream in blender for 1 minute Pour eggs in greased 7 12 x 11 12-inch baking dish Bake at 400 for 8 to 10 minutes until set in middle Spoon hot sauce over eggs and add sausage mixture Layer the 3 cheeses beginning with the Velveeta Casserole may be refrigerated or frozen at this point and baked later Bake uncovered at 300 for 45 minutes Remove from the oven and let set for 5 to 10 minutes before cutting and serving Serves 6 to 8