Speedy paleo frosting that's dairy free and refined sugar free!
In your mixer using the flat attachment, cream the butter until smooth (aka mix it until there's no lump - mom thought this meant add cream to your butter as a kid lol).
Once smooth, add in your instant coffee and powdered sugar. Slowly incorporate the mixture so you don't set off a powder party in the kitchen. Unless you want to have one. Then by all means, party on!
After it's mostly incorporated, slowly add in the milk while the mixer is still running. You may not need all of the milk but you want the icing to be smooth & thick-ish.
Remove from the mixer and add to the pipping back of your choice. Or a gallon ziplock that you can cut the end off of to pipe onto your desired cupcakes or cookies. This would absolutely be delicious on some shortbread cookies!
Enjoy. Consider sharing. And relish in the fact that you've been productive today but also now have a fabulous treat!