Place butter in a small bowl at room temperature.
Add lemon juice, garlic, parsley, chives, thyme, dijon mustard, salt, paprika, crushed red pepper flakes, cayenne, and black pepper.
Mix ingredients with a hand mixer or in a food processor until smooth and fully incorporated.
Lay out a long piece of plastic wrap, parchment paper, or wax paper on the counter.
Spoon the butter mixture into the center of the wrap and shape it into a butter log.
Wrap tightly and refrigerate until firm.
Slice with a sharp knife and serve on steak, fresh bread, vegetables, or other dishes.
Store leftover cowboy butter in an airtight container or freezer-safe container.