Boil pasta in salted water until al dente. Drain and set aside.
Melt butter in a pot. Whisk in flour for 1–2 minutes. Slowly add milk, stirring until thick (3–5 minutes).
Remove from heat, stir in cheeses, garlic and mustard powder, salt, and pepper. Add macaroni, mix well, keep warm.
Sauté onion and bell pepper in oil for 3–4 minutes. Add beef, cook until browned, drain fat. Stir in garlic, cook 1 minute. Add tomato paste, cook 1 minute.
Mix in ketchup, brown sugar, mustard, Worcestershire, spices. Simmer 8–10 minutes until thickened.
Heat tortillas briefly until soft and flexible.
Assemble Wraps
Fill each tortilla with ¾ cup mac and cheese, ½ cup sloppy joe, and ¼ cup shredded cheese. Fold and roll tightly.
Grill Wraps
In a greased skillet, cook wraps seam-side down for 2–3 minutes per side until golden. Press with spatula to seal.
Let sit for 1–2 minutes. Slice and serve warm.