Start by washing and chopping the broccoli into small, bite-sized florets. Freshly grate the cheddar cheese and measure the remaining ingredients. Having everything ready before cooking makes the process smooth and easy.
Place the macaroni, broccoli, milk, water, salt, and garlic powder into a large pot. Stir everything together well so the ingredients are evenly distributed before heating.
Set the pot over medium heat and bring the mixture to a gentle simmer. Stir frequently to prevent sticking and ensure the pasta cooks evenly while the broccoli becomes tender.
As the pasta cooks, the liquid will gradually thicken and become creamy. If the mixture seems too dry before the pasta finishes cooking, add a small splash of water to maintain the right consistency.
Once the pasta is tender, remove the pot from the heat. Gradually stir in the freshly grated cheddar cheese until completely melted and smooth.
Taste the mac and cheese and adjust with additional salt or black pepper if needed. Serve immediately while the sauce is hot, creamy, and perfectly silky.