In a pot, add cream cheese, sour cream, mayo, shredded cheddar, parmesan, the chopped spinach, garlic powder, and lemon juice. Mix until fully melted and combined and season with salt and pepper to taste.
8 oz cream cheese, ½ cup sour cream, ¼ cup mayo, ½ cup shredded cheddar cheese, ¼ cup parmesan, 1 tbsp garlic powder, ½ tsp salt, ½ tsp pepper, 1 tbsp lemon juice