Here's another post about blueberries but don't look away because these bars are so good that you'll want to make it now, especially when the blueberries season will end soon.
I sneaked in some coconut in the bar because I wanted to have extra texture in the crumb, and also because I had leftover coconut in the fridge. I think I made the best decision to include coconut in the recipe. The bars have a hint of coconut, sweet and lemony blueberry taste with buttery crunch top and bottom. They are good warm, straight after baking, but also delicious cold. Make sure to store bars in the refrigerator to keep the texture crisp. They will keep for a few days.
Blueberry-Coconut Crumb Bars
3 cups all-purpose flour
¾ cup granulated sugar
1 teaspoon baking powder
¼ teaspoon salt
2 teaspoons grated lemon zest (from 1 lemon)
½ cup sweetened grated coconut
1 cup (2 sticks) cold unsalted butter, cut into chunks, plus more for pan
1 large egg
¼ cup granulated sugar
1 tablespoon cornstarch
3 cups fresh blueberries (about 12 ounces)
1 tablespoon fresh lemon juice
Preheat oven to 375. Line a 9-by-13-inch baking pan with foil or parchment paper, overhanging edges to serve as handles. Lightly butter foil.
For bars: In a food processor, pulse flour, sugar, baking powder, salt, lemon zest, and coconut until combined. Add butter pieces and egg; pulse until dough resembles crumbly wet sand. Pat half of dough into the prepared pan.
For filling: In a medium bowl, stir together sugar and cornstarch. Gently fold in berries and lemon juice. Spread blueberry mixture evenly over crust, leaving a ½-inch border around the edges. Crumble remaining dough over berries.
Bake for 40 minutes, until top is golden brown and crust is firm. Transfer to a wire rack to cool completely. Use foil handles to lift bars from pan. Sprinkle with powdered sugar. Cover and store in refrigerator.
Source: adapted from Debbie Macomber's Christmas Cookbook