Macaroni Lasagna with Veggies and Dip

INGREDIENTS

• 2 cups grated low-fat cheddar
• 1 teaspoon crushed red pepper flakes
• Water, as needed
• 1 teaspoon Italian seasoning
• 1 (24 to 28-ounce) jar of your favorite pasta sauce
• 1/2 cup low-fat mayonnaise
• 3 tablespoons frozen chopped onions
• 2 to 2 1/2 cups whole wheat macaroni
• 1/2 cup low-fat sour cream
• 1/2 teaspoon supermarket-style garlic and herb seasoning mix
• 1 1/2 pounds precut mixed vegetables (about 6 cups celery, cauliflower, broccoli, and carrots)
• 1 pound extra-lean ground beef