Lightly coat a large sheet pan with non-stick cooking spray.
Prepare the bottom crust.
On a large cutting board or clean work surface, roll two ready-to-bake pie crusts together to form one large sheet of dough.
Trim the bottom crust.
Using a pastry wheel or sharp knife, trim the dough into a rectangle measuring approximately 12x16 inches, or to the best size that fits the sheet pan.
Transfer the bottom crust.
Gently roll the prepared crust around the rolling pin, then carefully transfer it to the prepared sheet pan. Unroll and position it evenly.
Add the strawberry filling.
Spread the strawberry preserves over the center of the crust, leaving a 1-inch border around all edges.
Prepare the top crust.
On the same cutting board or work surface, roll the remaining two ready-to-bake pie crusts together. Trim the dough to match the size of the bottom crust.
Place the top crust.
Gently roll the top crust around the rolling pin, transfer it to the sheet pan, and place it evenly over the strawberry preserves.
Seal the edges.
Use your fingers to pinch the top and bottom crusts together around the edges.
Crimp the edges.
Use a fork to gently press around the sealed edges to secure the filling inside and create a decorative border.
Vent the pastry.
Use a toothpick to poke small holes across the top center of the pastry to allow steam to escape during baking.
Brush with butter.
Brush the top and edges of the pastry evenly with the softened butter.
Bake the Pop-Tart.
Bake for approximately 25 minutes, or until the crust is golden brown. Rotate the sheet pan halfway through the baking time for even browning.
Monitor the filling.
If the strawberry filling begins to seep from the edges and a rimmed sheet pan is not being used, place a larger pan underneath to catch any drips. If needed, carefully remove excess jam from the pan and return the pastry to the oven to finish baking.
Cool the pastry.
Remove the Giant Strawberry Pop-Tart from the oven and allow it to cool while preparing the icing.
Prepare the icing.
In a small mixing bowl, whisk together the powdered sugar and milk until smooth and spreadable.
Ice the Pop-Tart.
Spread the icing over the center of the cooled pastry, leaving the crimped edges visible.
Garnish.
Immediately top the icing with sprinkles before it sets.
Slice and serve.
Cut into squares or rectangles and serve.
Notes
To make this recipe gluten-free, replace the ready-to-bake pie crusts with certified gluten-free pie crusts or homemade gluten-free pie dough.Confirm that the strawberry preserves are certified gluten-free, as some brands may contain additives or be processed in shared facilities.Use certified gluten-free powdered sugar and sprinkles, especially when preparing this recipe for someone with celiac disease or gluten sensitivity.Verify that the butter and milk are gluten-free and free from cross-contamination warnings.Prepare the recipe on a clean work surface with clean utensils, a clean rolling pin, and a clean sheet pan to avoid cross-contamination.If using gluten-free pie dough, handle it gently, as it may be more delicate than traditional pie crust. Chill the dough briefly if it becomes too soft to transfer.