1-Preheat oven to 350°F. Grease an 8×8-inch pan.

2-First Step: Prepare the crust Mix 2 cups graham cracker crumbs, 1/2 cup melted unsalted butter, and 1/4 cup granulated sugar in a bowl until combined. Press firmly into the prepared pan for an even layer. Bake for 10 minutes until lightly golden. This base holds up to the filling. For gluten-free, use certified crumbs.

3-Second Step: Make the filling While crust bakes, beat 1/4 cup softened unsalted butter, 1 cup packed brown sugar, 2 teaspoons ground cinnamon, 2 tablespoons all-purpose flour, and 1 large egg until smooth. Spread evenly over hot crust. Vegan tip: Use vegan butter and flax egg here. Return to oven.

4-Third Step: Bake the bars Bake 20-25 minutes more until filling sets and edges bubble slightly. Filling will firm as it cools. Watch closely to avoid overbaking, which dries the center. Total bake time keeps these dessert bars tender. Low-cal option: Bake 5 minutes less for softer set.

5-Fourth Step: Cool completely Remove from oven and cool on a wire rack for at least 2 hours. Room temperature or fridge speeds this. Cutting too soon leads to messy slices. Patience ensures clean pop tart bars cuts.

6-Fifth Step: Add the glaze Whisk 1 cup powdered sugar, 2 tablespoons milk, and 1/2 teaspoon vanilla extract until smooth. Drizzle over cooled bars. Let set 15 minutes. For thicker glaze, add less milk. Dairy-free milk works fine.

7-Final Step: Slice and serve Use a sharp knife for 16 even squares. Serve at room temp for best texture. These copycat brown sugar cinnamon pop tarts shine warm or chilled. Store as noted below.