Preheat your oven to 375°F. Thaw the peas, then blot them with a paper towel to get as much moisture off them as possible. Place the peas in a bowl and add the olive oil and garlic salt. Stir to coat evenly. Spread the peas on a baking sheet lined with parchment paper or aluminium foil. Bake for 30 minutes, then shake and stir them around to make sure they are cooked evenly. Check for crunchiness, if necessary, cook for 15 more minutes until desired crunchiness is achieved. Cool and serve.