Make the pasta. Make the pasta according to the package instructions, then drain using a colander.
1 pound elbow macaroni noodles
Make the roux. Set a 12-inch cast-iron skillet on your grill or stovetop, then allow to preheat for 4-5 minutes. Add ¼ cup (4 Tablespoons butter) to the cast iron. Add in the 6 Tablespoons flour, whisk to thoroughly combine, and cook over medium heat for 5-6 minutes or until the flour begins to brown.
¼ cup butter, ¼ cup all-purpose flour, 1 teaspoon Hey Grill Hey Beef Rub, ¼ teaspoon ground mustard powder
Add the milk and cream. Add the milk and heavy cream to the roux, then return to a boil. Stir in the Beef Rub, then remove the skillet from the fire and reduce the heat back down.
1 ½ cups milk, ½ cup heavy cream
Finish the cheese sauce. Stir in the Velveeta cubes and the shredded cheddar cheese, then whisk until the cheese is completely melted.
8 ounces Velveeta, 16 ounces medium cheddar cheese
Combine noodles and sauce. Add the drained noodles to the cheese sauce and stir to combine. You can continue to cook for longer if you like, but this dish is ready once the cheese is melted and the noodles are coated fully.
Serve immediately. Remove from heat, serve immediately, and enjoy!