1. Cook spinach in microwave as package directs, then drain.
2. Meanwhile, mix the oil, flour, and milk in a sauce pan, stirring to remove any lumps. Heat over low to medium heat stirring constantly until mixture thickens, or about 10 minutes. Remove from heat.
3. Add Hidden Valley® The Original Ranch® Light Dressing, black pepper and garlic powder (if using), and cooked spinach.
4. Stir to combine.