*If you want to use regular peanut butter, reduce butter by 2 tbsp (30 mL) and brown sugar by ¼ cup (60 mL)
In large bowl, beat together butter, brown sugar and granulated sugar until fluffy, beat in egg and vanilla. Beat in peanut butter.
Whisk together flour, baking soda and salt, stir into peanut butter mixture in 2 additions.
Drop by level tablespoons (15 mL), about 2 inches (5 cm) apart, onto greased or parchment paper – lined baking sheets. With floured fork, press each to make crisscross pattern and flatten to ½ inch (2 cm) thickness. With a back of a small spoon, make indent in centre of each, fill each with about ½ tsp (2 mL) jelly.
Bake in 350 degree F oven until golden on bottoms and edges are browned, 10 to 12 minutes. Let cool on pans on racks.