Grease the Slow Cooker: Lightly coat the inside of your slow cooker with cooking spray or coconut oil to prevent sticking.
Add Ingredients: Pour in the steel-cut oats, almond milk (or water), chia seeds, flaxseeds, cinnamon, and vanilla extract. Stir well.
Slow Cook: Cover and cook on LOW for 6-8 hours or HIGH for 3-4 hours, stirring occasionally if possible.
Add Protein: Once cooked, stir in the protein powder and Greek yogurt or cottage cheese until fully combined.
Serve & Top: Spoon into bowls and add your favorite toppings like nuts, fruit, or extra cinnamon.