Cook the macaroni according to package instructions. Drain and set aside.
2 cups elbow macaroni
In a large mixing bowl, toss the steak cubes with salt, pepper, smoked paprika, and garlic powder until evenly coated.
2 pounds sirloin steak, 1 tsp salt, 1/2 tsp black pepper, 1 tsp smoked paprika, 1 tsp garlic powder
Heat the olive oil in a 12-inch jumbo cast iron or jumbo cooker over medium-high heat. Add the steak cubes in a single layer- you will need to do this in batches or utilize multiple pans.
2 tbsp olive oil
Sear for 2-3 minutes per side until browned and cooked to your desired doneness. I err on the side of cooked through for meal prepping purposes, though I do love a rare steak. Anyways, remove from the pan and set aside.
In the same pan, lower the heat to medium. Add the butter, minced garlic, & chili flakes.
1/2 cluster garlic, 2 tbsp butter, 1/2 tsp red pepper flakes
Stir until fragrant, about 1 minute. Toss the cooked steak bites back into the pan and coat with the garlic butter sauce. Remove from heat and set aside.
In a large skillet over medium heat, melt the butter and whisk in the flour. Cook for 1 minute, stirring constantly.
2 tbsp butter, 2 tbsp all-purpose flour
Slowly add the milk, whisking until smooth. Cook for 2-3 minutes until the mixture thickens.
2 cups milk
Reduce the heat to low and stir in the cheddar, mozzarella, salt, pepper, ground mustard, and smoked paprika. Mix until melted and creamy.
2 cups shredded cheddar cheese, 1 cup shredded mozzarella cheese, 1/2 tsp salt, 1/2 tsp black pepper, 1/4 tsp ground mustard, 1/4 tsp smoked paprika
Add the cooked pasta to the cheese sauce and stir until evenly coated.
Divide the mac & cheese into four meal prep containers, topping each with garlic steak bites. Serve immediately or refrigerate for up to 4 days.