In a pot, combine strawberries, rhubarb, brown sugar, and cornstarch.
Cook on medium heat, stirring every 5 minutes, until it gets thick and syrupy (about 10-15 minutes).
Preheat your oven to 350°F (175°C).
Line a baking dish with parchment paper.
Take most of the cookie dough (¾ of it) and press it with your fingers into the bottom of the pan.
Pour the hot strawberry rhubarb mixture over the pressed cookie dough crust.
Grab the rest of the cookie dough and crumble it on top of the filling.
Bake the bars at 350°F (175°C) for 40 minutes.
Let the bars cool completely before cutting into squares.