Take one stick of butter at room temp,1 tsp. chopped rosemary and 1/2 tsp. garlic powder. Mix well. Place on a piece of plastic wrap and roll up. Place in refrigerator until hardened. Slice and enjoy on your favorite foods. Well, maybe not your favorite food, not sure how plum blueberry peach cake will taste with rosemary garlic butter. But you know what I mean :)
How about adding some Parmesan cheese with basil? Or chives and cheddar? The possibilities are endless.