Mix together the cornstarch and cream together, set aside. Then proceed by melting the butter in a pot over medium heat. Sauté the garlic and fajita mix until fragrant; this should take about 1 minute.
Then add the cream cheese, constantly whisk to melt the cheese.
Once melted, slowly add the milk mixture while whisking. Mix well.
Add the spinach, and season with salt and pepper. Mix well
Add the cayenne pepper, and mozzarella cheese. Topped with grated parmesan cheese and serve immediately.
Tips for best results
Use Fresh Chopped Spinach in place of frozen if you prefer. I do it by chopping baby spinach in batches in a food processor.