
Pre heat the oven to 350.
Bring a small pot of water with the frozen collard greens to a boil basically just to defrost and not to cook.
Drain the collard greens and set to the side.
Add 3 cups of mashed potatoes to a large mixing bowl. Add in garlic powder, onion powder, red pepper flakes and mix well.
Then mix in 1/2 cup of milk. Less milk can be used if your mashed potatoes are fresh.
Stir in the collard greens and shredded cheddar cheese. Mix until combined and pour into your baking dish.
Bake at 350 for 45 minutes.