Cook the pasta according to the package instructions, then drain and set aside.
Wash the cauliflower, cut it into small pieces, and cook until soft by steaming or boiling.
In a large skillet over medium heat, heat the heavy cream until warm, then add the shredded cheddar cheese and cream cheese. Stir continuously until the cheese melts and forms a smooth sauce.
Add the cooked pasta and softened cauliflower to the skillet, stirring to coat everything evenly in the cheese sauce.
Season the sirloin steaks with salt, pepper, and garlic seasoning. Cook the steaks in a hot pan or grill to your desired doneness, letting them rest for a few minutes before slicing.
Serve the cheesy cauliflower pasta alongside the steak, and enjoy.
Notes
Leftovers: Store mac & cheese in an airtight container for up to 5 days
Cauliflower: You can also use pre-riced cauliflower for finer pieces, eat roasted cauliflower on the side, or leave it out.
Less carbs/gluten-free: Leave regular pasta out