Put about 2 cups of water into a medium sized saucepan and bring to a boil over high heat. Boil until potatoes are tender. Drain potatoes.
Meanwhile, in a small saucepan, melt butter over medium heat. Add flour and stir until smooth. Add onion powder, garlic powder, salt, pepper, milk and heavy cream, and continue stirring until thickened to desired consistency and smooth. Add to peas and cream sauce to potatoes. Stir together and serve.