In medium sized mixing bowl, using hand mixer on medium speed, mix butter and sugar until creamy. Add egg, food coloring, and extract. Mix until well combined.
In a separate bowl, mix together 1-1/4 cup flour, baking powder, and salt. Gradually mix flour mixture into butter mixture until combined.
Shape cookies into 1" sized balls. Press indentation with thumb in center of ball.
Bake for 12 minutes. Remove from oven and press back of teaspoon into center of cookie to form a more prominent thumbprint. Place 1 teaspoon Andes mint candy pieces in center of cookie. Return to oven and bake another 2-3 minutes.
Remove from oven and transfer cookies to cooling rack. Cool completely.
Melt white dipping chocolate in microwave according to directions. Drizzle over top of cookies. Let chocolate harden prior to storing.
Notes
1 cookie = 1 serving138 cal, 9g fatNutrition information calculated using myfitnesspal is provided as a courtesy, but will vary depending on the specific brands of ingredients you use. Please consult with your doctor regarding specific health needs.