In a large bowl, cream together butter and sugar until fluffy (about 2 to 3 minutes).
1 cup butter, 1 cup sugar
Heat-treat the flour: Place 1 1/2 cups all-purpose flour in a microwave-safe bowl. Heat on high in the microwave for 2 minutes. Remove bowl, stir flour, and check temperature using a meat or candy thermometer. Temp of flour should be 175 degrees F or higher. Heat for another minute or until the temp is reached. Heat-treated flour will be a little chunky, so use a spoon to break it up. Pour all flour into a strainer and sift into another bowl. Use a spoon to push chunks of flour through the strainer. There will be a few hardened pieces that look like rice left in the strainer - throw those out.
1 ½ cup flour
Add in peppermint extract, flour, salt, food coloring, and milk. Beat until well combined.
½ teaspoon peppermint extract, ¼ tsp salt, 1 drop green food coloring, 2 tbsp milk
Beat in mini chocolate chips just until combined.
½ cup Mini chocolate chips
Store in sealed container in refrigerator for up to one week.
Notes
The raw flour must be heat treated to cook out bacteria like E. Coli. Do not skip this step.