Mantecaditos (Puerto Rican Thumbprint Cookies)

Name: Mantecaditos (Puerto Rican Thumbprint Cookies)
Prep time: 20 min
Cook time: 20 min
Total time: 40 min
Cuisine: Latin American
Ingredients: 1/2 lb vegetable shortening (8 oz); 1/2 lb salted butter, softened to room temp (2 sticks); 1¾ cup granulated sugar; 3 egg yolks; 1 tsp almond extract; 1/2 tsp salt; 4 cups all purpose flour (sifted); guava jelly or paste; nonpareil sprinkles (for garnish)