- Preheat the oven to 350°F. Line an 8×8-inch baking pan with parchment paper.
- Press the cookie dough evenly into the pan. If the dough gets sticky, lightly spray your hands with nonstick spray or use parchment to press it down.
- Sprinkle the white chocolate chips over the dough, then scatter the blueberries across the top. Gently press the blueberries slightly into the dough so they bake into the bars.
- In a small bowl, stir together the melted butter, brown sugar, flour, cinnamon, and salt until a soft crumble forms. Sprinkle the crumble evenly over the top.
- Bake for 25 to 30 minutes, or until the edges are golden and the center looks set but still slightly soft.
- Let the bars cool for at least 20 minutes before slicing so they stay gooey while holding their shape.
Vanilla Glaze Drizzle- optional
- Whisk everything together until smooth and drizzleable. If needed, add another tiny splash of milk.
- Drizzle over the bars once they have cooled slightly so the glaze melts in just a little while still staying pretty on top.