Preheat oven to 400 °F (200 °C).
Prep edamame: If frozen, thaw and pat dry completely. Moisture will prevent crisping.
Toss with oil & salt: Place edamame in a bowl, drizzle with olive oil (optional), and sprinkle with sea salt. Toss well.
Spread on a tray: Use a parchment-lined baking sheet. Keep beans in a single layer. Overcrowding will steam, not roast.
Bake: Roast for 12–15 minutes. Halfway, stir or shake for even roasting.
Optional flavor variations:
Sesame: Sprinkle with toasted sesame seeds after roasting.
Black garlic: Mix ½ teaspoon black garlic powder with salt.
Spicy: Add ¼ teaspoon chili or Shichimi Togarashi while still warm.
Cool & serve: Let edamame cool slightly — they’ll crisp more while resting. Taste and adjust salt if needed.