Using the paddle attachment of a stand mixer or working by hand, stir the softened 1/4 cup unsalted butter until soft and mashed.
Stir in the the 1 tablespoon lime zest, 1/4 teaspoon chili powder and 1/2 teaspoon fine sea salt until evenly mixed. Add the chopped 1 tablespoon cilantro, mixing until combined.
Transfer to an airtight container or roll in wax or parchment paper, chilling for at least 30 minutes before serving.
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Notes
Storage: Store your chili lime butter recipe in the refrigerator in an airtight container for up to three days.Freezing: Butter can also be frozen and thawed in the fridge or at room temperature.