Preheat oven to 425 degrees. Line a baking sheet with foil.
In a large bowl add the carrots, broccoli, cauliflower. Drizzle with olive oil and season with salt and pepper. Toss together. Spread on baking sheet and bake for 12-15 minutes until the broccoli and cauliflower begin to brown. Set aside.
Cook macaroni according to package directions. Drain.
While macaroni is cooking prepare the cheese sauce. In a large sauce pan combine the garlic, milk, and both cheeses. Heat over medium and stir constantly until the cheese is melted and forms a sauce.
Stir macaroni into the cheese sauce. Add roasted vegetables and stir to mix into cheese sauce.
Enjoy