In a mixing bowl, combine the unsalted butter, fresh rosemary, salt, ground black pepper, and garlic powder. Blend until smooth and creamy, about 2-3 minutes.

Taste and adjust the seasoning if necessary by adding more salt or pepper.

Shape or store the mixture in an airtight container or roll it into a log using parchment paper.

Chill in the fridge for at least 2 hours to allow flavors to meld.

Use and enjoy your rosemary butter on grilled meats, roasted vegetables, or warm crusty bread.