- Preheat the oven to 350°F (175°C). 
- In a large bowl, combine the cream cheese, mayonnaise, and sour cream. 
- Add the Parmigiano Reggiano, Pecorino Romano cheese, and minced garlic, and stir to combine. 
- Stir in the chopped artichoke hearts and spinach. 
- Season the dip with salt and pepper, to taste. 
- Transfer the dip to a 9-inch baking dish. 
- Bake for 20-25 minutes, or until the dip is hot and bubbly. 
- Serve immediately with your favorite keto-friendly vegetables or crackers.