Cheesy Spinach Dip

Cream cheese (room temperture, 8 oz (1 package))

Sour cream (1 cup)

Parmesan cheese (shredded, 1 cup)

Pepper jack cheese (shredded, 1 cup)

Mozzarella cheese (shredded, 1 cup)

Frozen chopped spinach (thawed, 10 oz (1 package))

Salt (1/2 tsp)

Pepper (1/4 tsp)

Garlic powder (1 tsp)