Get Ready: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper for effortless cleanup.
Mix Dry Goodness: In a large mixing bowl, combine the flour, sugar, baking soda, and salt. Give them a quick stir to ensure everything is evenly distributed.
Add the Creamy Fats: Now, add the shortening and creamy peanut butter to your dry ingredients. Using an electric mixer (or a sturdy spoon), blend until the mixture becomes coarse and crumbly, resembling wet sand.
Sweeten and Soften: Pour in the light corn syrup and milk. Continue mixing until a smooth, well-combined dough forms.
Shape & Chill: Gently shape the cookie dough into a log, about 2 inches in diameter. Wrap it tightly in plastic wrap or waxed paper. Pop it into the refrigerator for at least 3 hours (or the freezer for 1 hour) to firm up – this makes slicing a breeze!
Slice & Fill: Once thoroughly chilled, unwrap the dough log and slice it into ¼-inch thick rounds. Arrange half of these cookie slices about 3 inches apart on your prepared baking sheet. Spoon a teaspoon of your delicious strawberry jam onto the center of each cookie slice.
Seal the Deal: Take the remaining cookie slices and carefully place one on top of each jam-filled cookie. Gently press the edges together with a fork to seal in that yummy jam.
Bake to Perfection: Bake for 12 to 14 minutes, or until the edges are lightly golden brown.
Cool Down: Let the cookies cool on the baking sheet for 2 minutes before carefully transferring them to a wire rack to cool completely. Enjoy your wholesome, homemade stuffed cookies!