Microwave the flour in 20 second intervals until it reaches 165℉ degrees, about 40-60 seconds. Alternatively, you can spread the flour on a baking sheet and bake the flour in a 350 ℉ degree oven or 3-5 minutes. Wisk or sift to remove any lumps and let cool.
Using a standing mixer with a beater attachment, or a using a large bowl with a hand-held mixer, cream the butter and sugar for 1-2 minutes until light and fluffy. Add in the cooled flour, vanilla, and 1 tablespoon milk. Mix until combined, scraping down the sides of the bowl as needed.
Check the consistency, mixing in milk a few teaspoon at a time until you get your desired consistency.
Gently fold in an optional add-ins and enjoy!
