On stovetop or in a microwave oven, blanch the carrots in covered dish until tender-crisp. Layer half of the carrots in shallow 2-qt. baking pan; cover with half of the cheese. Repeat layers. To make sauce, saute onion in butter for 2 minutes; blend in flour and seasonings. Cook, stirring, for 1 minute. Add milk all at once; cook, stirring, until thickened. Pour sauce over carrot-cheese layers. Combine bread crumbs and butter; sprinkle over all. Top with bacon. Bake at 350° for 25 minutes. Yield: 8 servings.