Add the cream cheese, cottage cheese, parmesan cheese, lemon juice, garlic clove, hot sauce, and salt and pepper to taste in the bowl of a food processor and blend until very smooth, about 1 minute, scraping inside of the bowl as needed.
Add the baby spinach to the food processor and pulse until it's broken and slightly blended.
Transfer to a serving bowl and serve at room temperature with toast or crackers.
If making a hot spinach dip, transfer to an oven-safe dish, sprinkle with mozzarella cheese and bake in a preheated oven at 375°F for 20-25 minutes, or until the dip is hot and cheese and melted. Serve immediately with toast or crackers.