[Mexican] How to cook Cheesy Spinach Enchiladas

Ingredients
- 1 tablespoon butter
- 1 tablespoon flour
- 2 15-ounce cans mild or medium enchilada sauce
- 1 tablespoon taco seasoning
- 8 large flour tortillas
- 4 cups shredded Mexican-blend cheese
- 4 cups baby spinach leaves, roughly chopped
- optional: chopped cilantro