Fill a large pot with 6-8 cups of filtered water and bring it to a rolling boil. This takes about 5-7 minutes. While you're waiting, add a generous pinch of salt (about 1 teaspoon), your dried garlic flakes, and onion flakes to the pot. This seasons the pasta from the inside out—a trick I learned from my grandmother that makes all the difference. The water should taste like a light sea.

Add your fettuccine noodles to the boiling seasoned water and cook for 8-10 minutes, stirring occasionally so they don't stick together. Fresh pasta cooks faster (about 3-4 minutes), while dried takes the full 10. The goal is tender but still slightly firm when you bite it—never mushy. About 2 minutes before the pasta finishes, reserve 1 cup of starchy pasta water in a separate bowl. This liquid gold will help adjust your sauce consistency later.

Slice your bell peppers and zucchini into thin, uniform strips while the pasta water comes to a boil. Think matchsticks or thin ribbons—the more consistent the size, the more evenly they'll cook. Dice your fresh tomatoes into small chunks and set them aside. As a registered dietitian, I always say: prep your vegetables first and everything else falls into place. This is when the magic of mise en place—everything in its place—transforms your cooking from chaotic to calm.

Heat a grill pan or skillet over medium-high heat and add a light coating of cooking oil. Pat your chicken breasts dry with paper towels and season generously on both sides with salt and pepper. Place them in the hot pan and cook for 6-7 minutes per side, or until the internal temperature reaches 165°F. The breasts should be golden brown with a slight crust. Once cooked, transfer them to a cutting board and let them rest for 3 minutes—this keeps them juicy and tender.

In a large skillet, bring ¼ cup of water to a gentle simmer over medium heat. Add all your sliced peppers and zucchini to the pan. Cover and cook for 3-4 minutes, stirring once halfway through. You want them tender-crisp, still with a little bite to them—not soft or mushy. Add a small pinch of salt. When they're done, drain any excess water and set the vegetables aside on a clean plate. They'll keep their beautiful color and snap this way.

In a medium saucepan, melt 3 tablespoons of butter with 2 tablespoons of olive oil over medium heat. Add your minced fresh garlic and cook for about 30 seconds until fragrant—don't let it brown or it turns bitter. Slowly pour in your 2 cups of heavy cream, stirring constantly. Add 1 tablespoon of fresh parsley and ¼ teaspoon of white pepper. Let this simmer gently for about 8 minutes, stirring frequently, until the mixture thickens slightly. Then remove the pan from heat and stir in your freshly grated Parmigiano-Reggiano cheese and mozzarella cheese, stirring until completely melted and smooth. The sauce will continue to thicken as it cools. Taste and adjust salt as needed. If it's too thick, thin it with a splash of reserved pasta water.

Drain your cooked fettuccine and toss it with 2 tablespoons of butter and fresh parsley. Divide the buttered noodles among four shallow bowls or plates. Pour the warm alfredo sauce generously over the pasta. Slice each chicken breast into strips and arrange on top of the sauce. Add your steamed vegetables in a colorful pile, then top everything with your fresh diced tomatoes. Finish with a small handful of shredded mozzarella and a sprinkle of fresh parsley. Serve immediately while the sauce is still warm and silky.