Spinach and Artichoke Dip

small shallot, minced (about 1 tablespoon) 

garlic clove, minced 

fresh baby spinach  

frozen (or canned) artichoke hearts, thawed and roughly chopped 

grated Parmesan-Reggiano 

grated low-moisture mozzarella, plus more for topping  

cream cheese, softened

creme fraiche (or sour cream) 

red pepper flakes 

Worcestershire sauce

hot sauce of choice (add less or more depending on desired spice level) 

Salt to taste (about 1/2 teaspoon) 

Tortilla chips or slices of bread for serving