Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone baking mats.
In a large mixing bowl, cream together 1 cup shortening, 1/2 cup sugar, and 1/2 cup packed brown sugar until light and fluffy, about 2-3 minutes on medium speed.
Beat in 2 eggs, one at a time, ensuring each is fully incorporated. Add 1 1/2 teaspoons vanilla extract, 1/2 teaspoon butter flavoring (if using), and 2 drops pure peppermint extract. Mix until smooth and fragrant.
In a separate bowl, whisk together 2 3/4 cups all-purpose flour, 1 teaspoon salt, and 1/2 teaspoon baking soda.
Gradually add dry ingredients to the wet mixture, mixing on low speed or folding with a spatula until just combined. Avoid overmixing.
Gently fold in 1/2 cup crushed peppermint candies.
Use a cookie scoop or tablespoon to drop rounded spoonfuls of dough onto the prepared baking sheets, spacing about 2 inches apart.
Bake for 10-12 minutes, until edges are set and beginning to turn golden. Centers may look slightly underbaked but will firm up as they cool.
Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.