Preheat your oven to 350 degrees Fahrenheit.
In a mixing bowl, combine sour cream, mayonnaise, cream cheese, and Parmesan cheese until smooth.
Add in the minced garlic, artichoke hearts, and spinach. Stir gently to incorporate.
Cut the French bread loaf in half lengthwise and place it cut side up on a baking sheet lined with parchment paper.
Spread the creamy mixture evenly over the cut sides of the bread.
Sprinkle the top with mozzarella cheese.
Bake for 10 minutes, then broil for the last minute for a crispy finish.
Remove from oven and let cool slightly before slicing.
