Step 1: Cook the Pasta - Bring a large pot of water to a boil, season with salt and chicken bouillon, and cook the pasta until al dente (7–10 minutes). Drain, rinse with cold water, and set aside.
Step 2: Start the Sauce Base - In a saucepan, pour in the whole milk and bring to a gentle simmer. Season with onion powder, garlic powder, dry mustard, white pepper, salt, and black pepper.
Step 3: Add Creaminess - Stir in cream cheese until smooth and velvety. This step creates the creamy foundation for the sauce.
Step 4: Melt in the Cheeses - Add half the pepper jack and half the white cheddar to the saucepan. Stir until completely melted and silky. Mix in grated parmesan for extra richness.
Step 5: Combine Pasta and Sauce - Place the cooked pasta in a large bowl, then pour the cheese sauce over it. Stir thoroughly to coat every piece of pasta in the cheesy goodness.
Step 6: Bake to Perfection - Grease a cast iron skillet or baking dish with butter. Pour in the pasta mixture, then top with the remaining white cheddar, pepper jack, and parmesan. Bake at 350°F (175°C) for 25–30 minutes until bubbly and golden brown. Serve warm and enjoy!
