Can I melt butter to make compound butter, and subsequently refrigerate? I want to make compound butter using my powerful blender. I am having trouble doing this with solid or soft butter because the blender cannot create a vortex and mix as well compared to blending with liquids. I was thinking of melting the butter and adding ingredients (e.g., shallots) and blending it into a beautiful liquid, and then refrigerating it. What would this do?
No need to go power tool.

Just use soft butter, a spatula and your herbs and/or spices; mix them all up in a regular bowl.

If you melt butter it will separate the fat from the milk solid and will never solidify after that.