In a medium bowl, combine the thawed and squeezed spinach, Monterey Jack cheese, cheddar cheese, minced garlic, cumin, salt, and pepper. Mix well until evenly combined.
Warm the corn tortillas slightly to make them pliable. You can do this by wrapping them in a damp paper towel and microwaving for 30 seconds, or by warming them briefly in a dry skillet.
Lay out a tortilla. Spoon about 2 tablespoons of the spinach and cheese mixture onto the center of the tortilla. Roll up the tortilla tightly to form a taquito.
Repeat with the remaining tortillas and filling.
Brush the taquitos lightly with olive oil. Place them seam-side down on a baking sheet.
Bake for 15-20 minutes, or until the taquitos are golden brown and crispy, flipping halfway through.
Serve hot with your favorite dipping sauces like salsa, sour cream, or guacamole.
Notes
These spinach taquitos are a crowd-pleaser! You can also add a pinch of red pepper flakes to the filling for a little heat.