I just found this recipe from the Picky Palate. Our family tried them and loved them!
2 sticks softened butter
1 cup packed brown sugar
1 cup granulated sugar
3 Tablespoons corn syrup
2 large eggs plus 1 egg white
1 Tablespoon pure vanilla extract
3 1/2 cups all purpose flour
1 1/4 teaspoon baking soda
1/2 teaspoon salt
1 bag Reeses Peanut Butter Cups, chopped.
1. Preheat oven to 350 degrees F. In a stand or electric mixer beat the butter, sugars and corn syrup until well combined….light and fluffy. Beat in eggs and vanilla until well combined.
2. In a large bowl, mix the flour, baking soda and salt. Slowly add to wet ingredients along with the chopped Reeses Peanut Butter Cups (probably don't need the whole bag). Mix only until just combined. Using a medium cookie scoop, scoop dough onto baking sheet. Bake for 9-11 minutes until just turning golden around edges. Let cookies cool for 5 minutes before transferring to a cooling rack.
Yields 4 dozen cookies