1-First Step: Prepare your workspace Set out 1 cup (2 sticks) unsalted butter at room temperature (65-70°F). Sift 4 cups powdered sugar to remove lumps. Measure 1 tablespoon vanilla extract and have 2-4 tablespoons heavy cream ready. This mise en place keeps things smooth. For vegan adaptations, use plant butter here.

2-Second Step: Beat the butter Place butter in a large bowl. Use an electric mixer on medium speed for 2 minutes until creamy and pale. Scrape sides to ensure even texture. Cold butter leads to grainy results, so let it soften fully. This base sets up fluffy buttercream frosting.

3-Third Step: Add powdered sugar gradually Mix in sugar 1 cup at a time on low speed to avoid clouds of dust. After each addition, beat on medium for 30 seconds. Once all sugar incorporates, increase to high for 1 minute. Patience prevents a gritty buttercream recipe.

4-Fourth Step: Incorporate vanilla and cream Add 1 tablespoon vanilla extract and 2 tablespoons heavy cream. Beat on low, then high for 3-5 minutes until light and fluffy. Peaks should form when lifted. Add more cream 1 tablespoon at a time for spreadable cookie frosting. Taste and adjust vanilla for bolder flavor.

5-Fifth Step: Test and use Spoon a bit onto a spoon; it should hold shape yet spread easily. Pipe a test swirl on parchment. Use right away on cooled cakes or cookies. For chocolate buttercream frosting for cakes, stir in 1/2 cup cooled melted chocolate after sugar. Chill 15 minutes if too soft for decorating.