Soften the butter: Let 1 cup (2 sticks) of unsalted butter sit at room temperature until easily spreadable. If rushed, cut into cubes to speed it up.
Prep flavors for the air fryer: Dice garlic and shallots, or set out nuts, spices, or sun-dried tomatoes. Toss with a teaspoon of olive oil if dry.
Air fry aromatics: Set the air fryer to 325°F (163°C).
Place aromatics on a small foil-lined tray or heatproof dish. Cook 3–6 minutes, shaking once, until lightly golden and fragrant. Avoid burning—pull early if needed.
Cool briefly: Let the hot ingredients cool 2–3 minutes so they don’t melt the butter on contact.
Mix the butter base: In a bowl, combine the softened butter with a pinch of salt. Stir until creamy.
Choose your variation: Fold in your flavor mix (see options below).
Taste and adjust salt, acid (lemon juice), heat (chili), or sweetness as needed.
Shape and chill: Spoon onto parchment, roll into a log, and twist ends. Chill 1 hour to firm, or freeze 20–30 minutes for quicker use.
Slice and serve: Cut coins to melt over steaks, chicken thighs, salmon, roasted veggies, baked potatoes, corn, or warm bread.