Peanut Butter Hidden Middles

1 (1 pound 1.5 ounce) pouch peanut butter cookie mix
1/3 cup vegetable oil
1 egg
36 miniature marshmallows
12 one-inch chocolate-covered peanut butter cup candies
12 chocolate-covered peanut-buttery candy balls (about 1/2 inch in diameter) Sugar
Heat oven to 375. Empty cookie mix into large bowl. Break up lumps in mix with spoon.
Stir in oil and egg until soft dough forms.
Divide dough into thirds. Shape one-third dough by tablespoonfuls around 3 miniature marshmallows. Shape one-third dough by tablespoonfuls around 1 peanut butter cup. Shape one-third dough by tablespoonfuls around 1 candy ball. Roll each ball in sugar.
Place about 2 inches apart on ungreased cookie sheet. Bake 7 to 9 minutes or until light golden brown. Cool 1 to 2 minutes; remove from cookie sheet to wire rack.