Line the baking dish with the aluminum foil making sure to leave a few inches on two ends of the foil to grab and lift after the bars are fully baked.
Liberally spray the dish and the foil with baking spray. Set aside.
In a small bowl, whisk together the flour, baking powder, and salt.
In a large bowl, whisk together the butter, egg, and vanilla until combined. Add ½ cup of granulated sugar and whisk until smooth and creamy.
Switch to a wooden spoon or spatula and stir the flour mixture into the butter and sugar mixture until a smooth, soft dough forms.
Spoon half of the dough into the prepared baking dish and with a spoon or offset spatula, smooth the dough evenly over the bottom of the pan.
Place the strawberry jam over the crust layer of the bars, and use a spoon or offset spatula to evenly spread the jam over the dough.
Top the jam with an even layer of sliced strawberries.
Use the remaining dough to evenly dollop over the entire top of the strawberries.
Sprinkle the top of the dough with the sliced almonds and 1 tablespoon of granulated sugar.
Bake in a preheated oven for 40-45 minutes or until the dough is golden brown.
Remove from the oven and cool on a wire rack for 30 minutes.
Remove the cobbler bars from the semi-cooled pan by gently lifting, using the aluminum foil excess on the opposite sides of the pan.
Place the semi-cooled bars on a flat surface and allow to cool completely.
Slice, serve, and enjoy!