In a large bowl, combine the cream cheese, mayo, half (6 oz.) of the Mexican cheese, chili powder, red pepper flakes, cumin, cayenne, salt, oregano, and black pepper. Use a hand mixer to blend until smooth.
2 (8 oz.) packages cream cheese, 1/4 cup mayonnaise, 12 oz. shredded Mexican cheese blend, 1 tbsp. chile powder, 1-1/2 tsps. red pepper flakes, 1/2 tsp. ground cumin, 1/2 tsp. cayenne pepper, 1/2 tsp. table salt, 1/4 tsp. oregano leaves, 1/4 tsp. coarse ground black pepper