CUT 4 Kraft Singles diagonally in half. Spray 13x9-inch baking dish with cooking spray; cover bottom with 6 bread slices. Top with layers of half each of the ham, broccoli and onions; cover with Kraft Singles triangles. Repeat layers of bread, ham, broccoli and onions. Refrigerate remaining Singles for later use.
WHISK eggs and pepper in medium bowl with whisk until blended. Gradually beat in milk; pour over ingredients in baking dish. Cover. Refrigerate 3 hours.
HEAT oven to 350°F. Bake casserole, uncovered, 45 min. Cut remaining Singles diagonally in half; place over casserole. Bake 10 to 15 min. or until centre is set and Singles are melted. Let stand 10 min. before cutting to serve.
serving size = 1 piece (228 g)