Get Ready to Bake: Start by preheating your oven to a cozy 350°F (175°C). Line a baking sheet with parchment paper to ensure your cookies don't stick.
Combine Dry Ingredients: In a large mixing bowl, simply whisk together the all-purpose flour, granulated sugar, baking soda, and salt until they're nicely blended.
Mix in the Good Stuff: Add the shortening and creamy peanut butter to your dry mixture. Using electric beaters (or a sturdy spoon), mix until the dough resembles coarse, delicious crumbs.
Form the Dough: Pour in the light corn syrup and milk. Continue mixing until a soft, cohesive dough forms that's easy to handle.
Shape and Chill: Gently shape this lovely dough into a log, about 2 inches in diameter. Wrap it snugly in waxed paper or cling wrap. Place it in the refrigerator for at least 3 hours to firm up, or if you're in a hurry, pop it in the freezer for 1 hour. This chill time is essential for perfectly neat cookies!
Slice and Fill: Once your dough is properly chilled, unwrap the log and slice it into neat ¼-inch thick rounds. Arrange half of these cookie slices about 3 inches apart on your prepared baking sheet.
Add the Jammy Center: Spoon a small teaspoon of your favorite strawberry jam onto the center of each cookie slice on the sheet. Be mindful not to overfill!
Seal Them Up: Place the remaining cookie slices on top of the jam-filled ones, forming little sandwiches. To seal them securely and add a charming touch, gently press around the edges of each cookie with a fork.
Bake to Perfection: Bake in your preheated oven for 12 to 14 minutes, or until the edges are just lightly golden brown.
Cool and Enjoy: Allow the cookies to cool on the baking sheet for 2 minutes before carefully moving them to a wire rack to cool completely. These delicious, moist cookies store wonderfully in an airtight container for up to 5 days.