Cook the pasta: Bring 4–5 quarts of salted water to a boil. Add the elbow noodles (1 pound) and cook until al dente, about 8 minutes. Before draining, reserve ½ cup of the pasta water. Drain and set aside.
Warm the milk: In a large, heavy-bottomed skillet or saucepan, add the milk (1 1/2 cups) and butter (if using) (2 tablespoons). Warm gently over medium heat until steaming — don’t let it boil.
Season: Stir in the pepper (1/2 teaspoon), spicy brown mustard (1/2 teaspoon), and salt (1/2 teaspoon).
Melt the cheese: Add the Velveeta cubes (1 pound) a handful at a time, stirring constantly until each addition melts completely before adding more. This keeps the sauce glossy and smooth.
Add Tabasco: Once the cheese is fully melted, stir in 1/4 teaspoon of Tabasco sauce. It won’t make the dish spicy — it just adds a subtle tang that cuts through the richness and brightens the flavor.
Combine: Add the drained noodles to the cheese sauce, folding gently until every piece of pasta is coated. If the sauce feels too thick, add a splash of the reserved pasta water to loosen it.
Rest and serve: Remove from heat and let the mac and cheese rest for 2–3 minutes. The sauce will thicken slightly and cling perfectly to the noodles. Serve warm.
Notes
Don’t rush the melt. Velveeta loves gentle heat — too high and it can split or feel oily. Stir patiently for that restaurant-smooth finish.
Taste before serving. Cheese sauces can vary in saltiness depending on the brand. Always adjust right at the end.
Add-ins welcome! Stir in chopped bacon, green chiles, or diced tomatoes for a fun twist. Or top with toasted breadcrumbs and bake briefly for a golden crust.