HEAT oven to 350°F.
COOK sausage, onions and peppers in large skillet on medium heat 6 to 8 min. or until sausage is done, stirring occasionally. Drain; return to skillet. Stir in salsa and half the VELVEETA; spread onto bottom of 13x9-inch baking dish sprayed with cooking spray.
WHISK eggs and sour cream until well blended; pour over sausage mixture. Top with remaining VEVLEETA.
BAKE 40 min. or until center is set.
