Preheat oven to 375. Grease/spray a 13" x 9" baking dish; set aside.
Place potato slices in a large bowl; add spinach, onions and garlic; toss well to evenly distribute.
In a separate bowl, combine half and half, melted butter, cheese, salt, pepper, paprika, parsley and hot sauce; stir together well; pour this mixture over potato mixture and stir well to evenly combine.
Pour into the prepared baking dish; cover and bake at 375 for 50-60 minutes (or until potatoes are tender).
Uncover and continue to bake for an additional 20 minutes.