Preheat oven to 350 degrees F. In a medium skillet, set over medium heat, add the spinach. Allow it to wilt, about 2 to 3 minutes. Transfer to a bed of paper towels or a clean kitchen towel. Squeeze the water out of the spinach and then place it in a medium bowl.
In that same skillet, set over medium heat, add in the olive oil and shallots. Add a pinch of salt and cook until softened, about 1 to 2 minutes. Transfer to the bowl with the spinach.
And then add in a few roasted garlic cloves (you can be the best judge of how many you want to add! I added about 3 garlic cloves). Next, add the cream cheese, Parmesn-Reggiano, 3/4 cup mozzarella, sour cream, red pepper flakes, Worcestershire and hot sauce. Mix together vigorously with a spoon OR you can use an electric hand mixer. You want it thoroughly all mixed. Then fold in the artichokes.
And transfer it to a baking dish. Top it with the remaining 1/4 cup of mozzarella and transfer to the oven to bake for 25 minutes. The cheese should be all melty and delicious looking. If you want it browned (like mine), turn on the broiler and DO NOT WALK AWAY. It’ll probably need 1-2 minutes to get browned.
Serve with tortilla chips or slices of bread. See below in the NOTES section for options on ingredients and make-ahead directions.