Preheat oven to 185 degrees F. Lightly oil a 9×9 baking dish or coat with nonstick spray.

To make the alfredo sauce, melt butter in a saucepan over medium heat. Add garlic, and cook, stirring frequently, until fragrant, about 1-2 minutes. Gradually whisk in heavy cream. Cook, whisking constantly, until incorporated, about 1-2 minutes. Stir in Parmesan until slightly thickened, about 1-2 minutes. If the mixture is too thick, add more heavy cream as needed; season with salt and pepper, to taste. Set aside.

Heat a large skillet over medium high heat. Add bacon and cook until brown and crispy, about 6-8 minutes. Drain excess fat; reserving 1 tablespoon in the skillet. Transfer bacon to a paper towel-lined plate.

In a gallon size Ziploc bag, add chicken, 1 tablespoon olive oil and Ranch Seasoning, shaking to coat thoroughly. Add chicken to the skillet and cook, flipping once, until cooked through, about 2-3 minutes on each side; set aside.

In a large pot of boiling salted water, cook pasta according to package instructions; drain well.

Add pasta to the prepared baking dish and layer with chicken and alfredo sauce; sprinkle with cheeses and bacon. Place into oven and bake until bubbly and heated through, about 15-20 minutes.

Serve immediately, garnished with parsley, if desired.