Soften 1 cup of unsalted butter in a large mixing bowl and beat until creamy and fluffy, about 1-2 minutes.

Add 1 teaspoon of peppermint extract, a pinch of salt, and 2 tablespoons of heavy cream or milk. Mix on low speed until combined, about 1-2 minutes.

Gradually sift in 4 cups of powdered sugar, starting on low speed. Increase speed to medium and mix until the dough thickens, about 3-4 minutes.

Optionally, to add color, divide dough and knead in gel food coloring until achieving desired shades.

Dust a clean surface with powdered sugar and roll portions of the dough into thin ropes, cut into 1-inch pieces.

Place cut mints on parchment paper and let air dry for at least 8 hours or overnight.