1Heat oven to 375°F. In medium bowl, stir cookie mix, oil, water and egg until soft dough forms. Shape dough into 36 balls, about 1 inch each. Place 2 inches apart on ungreased cookie sheet.
2Bake 8 to 10 minutes or until edges begin to brown. Remove from oven and immediately make indentation in center of each cookie with back of spoon. Cool 2 minutes; remove from cookie sheet to wire rack. Cool completely, about 30 minutes.
3Fill each thumbprint with 1/2 teaspoon jam. If desired, drizzle cookies with chocolate glaze. To make glaze, in small microwavable bowl, microwave frosting on High 10 seconds or until thin enough to drizzle.