Cook the Pasta: Bring a large pot of salted water to a boil. Add the fusilli pasta and cook according to package instructions until al dente. In the last 3 minutes of cooking, add the broccoli florets to the pot. Drain and set aside.
Cook the Chicken: In a large skillet, heat the olive oil over medium heat. Add the diced chicken and season with garlic powder, onion powder, ranch seasoning, salt, and pepper. Cook the chicken, stirring occasionally, for about 5-7 minutes or until it's no longer pink and cooked through.
Make the Sauce: Reduce the heat to low, then pour in the heavy cream, stirring to combine. Allow the cream to heat through for about 2 minutes. Gradually add the shredded cheddar cheese, stirring until melted and the sauce is creamy.
Combine: Add the drained pasta and broccoli to the skillet with the chicken and sauce. Toss everything together until well coated in the creamy ranch sauce. Adjust seasoning with extra salt and pepper if needed.
Serve: Remove from heat and let it sit for a minute before serving. Garnish with freshly chopped parsley for a pop of color and flavor.