Preheat oven to 375°F. Spray a 9x9 baking dish.
Cook pasta according to package directions until al dente. Drain.
Cook bacon until crispy. Set aside and reserve some grease.
Season chicken with salt and onion powder. Cook in bacon grease until done. Dice or shred.
In a saucepan, melt butter over medium heat. Add garlic and sauté briefly (do not burn).
Stir in heavy cream and bring to a gentle simmer.
Add Parmesan, salt, and pepper. Stir until thickened.
Layer baking dish with pasta, chicken, cheese, and bacon.
Pour sauce evenly over layers.
Top with remaining cheese and parsley.
Bake 20–25 minutes until bubbly and melted.
Let rest 5 minutes before serving.