HEAT oven to 350º F.
BRUSH muffin pieces with Italian dressing.
BEAT next 3 ingredients in medium bowl with whisk until well blended. Add all remaining ingredients except muffin pieces; mix well. Pour into 9-inch pie plate sprayed with cooking spray. Top with muffin pieces, rounded-sides against edge of pie plate, to form scalloped edge.
BAKE 30 to 35 min. or until top is puffed and knife inserted in centre comes out clean.
serving size = 1 piece (106 g)