30-Minute Homemade Tagalong Cookie Bars
Three-layer shortbread bars inspired by the Girl Scout classic, with buttery vanilla shortbread crust, smooth peanut butter filling, and chocolate-shortening topping. Sweet and salty flavors balance rich peanut butter with crisp chocolate coating. Perfect for dessert lovers, potlucks, or gift-giving. This version layers flavors gradually for distinct textural contrast and uses melted shortening in the chocolate to prevent cracking.
Ingredients
- ½ cup butter, softened, for crust
- 1 cup all-purpose flour, for crustgluten-free 1-to-1 flour blendequal qtydietarygluten-free
maintains structure
- ⅓ cup powdered sugar, for crust
- 1 tablespoon cornstarch, for crust
- 1 teaspoon vanilla extract, for crust
- 2 tablespoons butter, melted, for filling
- 1 cup creamy peanut butter, for filling
- ½ cup powdered sugar, for filling
- ½ teaspoon vanilla extract, for filling
- 9 ounces semi-sweet chocolate chips, for toppingdark chocolateequal qtypreference
darker flavor
- 3 tablespoons shortening, for chocolate layer
- sea salt, for topping(optional)
Instructions
- 1
Preheat oven to 350F.
- 2
Line an 8x8 or 9x9 baking pan with aluminum foil with overhang, spray with cooking spray.
- 3
For shortbread crust: combine flour, powdered sugar, cornstarch, vanilla extract, and softened butter in a bowl. Cut in butter with pastry cutter or spoon until crumbly.
- 4
Transfer dough to pan and press into an even layer with fingertips.
- 5
Pierce dough randomly with fork about a dozen times to allow steam to escape.
- 6
Bake 12 to 15 minutes until barely set and still white, not golden.
- 7
While crust bakes, make peanut butter filling by combining peanut butter, powdered sugar, vanilla extract, and melted butter in a bowl. Stir until smooth.
- 8
Spread peanut butter filling over warm crust carefully with spatula or fingers to avoid tearing.
- 9
For chocolate layer: combine chocolate chips and shortening in microwave-safe bowl. Heat at 30-second intervals, stirring after each, until smooth.
- 10
Pour chocolate over peanut butter layer, spread evenly.
- 11
Cover pan with foil and refrigerate at least 3 hours or overnight until set.
- 12
Lift bars from pan using foil overhang. Sprinkle lightly with sea salt if desired.
- 13
Allow bars to come to room temperature a few minutes before slicing.
Tips
Spread peanut butter filling while shortbread crust is still warm so it adheres better and spreads more easily without cracking the delicate base.
Adding shortening to melted chocolate prevents the coating from cracking when cold and helps it set with a snappy texture rather than becoming brittle.
Allow refrigerated bars to sit at room temperature briefly before slicing for cleaner edges and easier serving.
Good to Know
Store bars in an airtight container in the refrigerator for up to 10 days, or freeze in an airtight container for up to 3 months.
Bars can be prepared 1 day ahead. Keep covered in refrigerator. Slice only when ready to serve.
Serve at room temperature or chilled, with cold milk or coffee. Brings well to potlucks and holiday exchanges.
Common Mistakes
Overbake the shortbread crust to avoid a tough, dry base that won't support filling properly
Spread peanut butter filling on cold crust to avoid tearing or breaking the delicate shortbread layer
Skip the shortening in chocolate to avoid cracking when cold and hardening into a brittle texture
Substitutions
Dairy-Free Swaps
Gluten-Free Swaps
maintains structure
General Alternatives
FAQ
Can I use natural peanut butter instead of creamy?
Yes, but natural peanut butter may separate during storage. Stir well before using and press filling firmly into crust to ensure it sets properly with the chocolate topping.
What if my chocolate layer cracks when I cut into it?
This happens when chocolate is too brittle. Ensure you added shortening as directed. Next time, let bars sit at room temperature for 5-10 minutes before slicing for a more pliable chocolate layer.
How long can I keep these bars in the freezer?
Frozen bars keep for up to 3 months in an airtight container. Thaw at room temperature for 15-20 minutes before serving, or enjoy them partially frozen for a fudgy texture.