Cut the pepperoni, keep aside, grate the cheddar cheese, and mozzarella. Open the burrito and arrange the pepperoni into diameter. Add the cheddar cheese, garlic salt, and mozzarella. Note: the comparison for cheddar and mozzarella cheese is 1:2. If you spreads one tablespoon of cheddar cheese, then two tablespoons of mozzarella cheese.