Southwest Spinach Dip

16 oz frozen chopped spinach 8 oz reduced-fat cream cheese 1 1/4 cup reduced-fat Mexican cheese 10 oz can diced tomatoes with green chiles, undrained 1 packet taco seasoning* *Instead of a packet, I prefer to measure out spices as follows: 1 tbsp chili powder 1 1/2 tsp cumin 1 tsp paprika 1 tsp black…