– 2 1/4 cup rolled oats
– 2 1/4 cup all-purpose flour
– 1 1/2 cup brown sugar
– 1 cup (2 sticks) butter
– 1 1/2 tsp. baking soda
– 1/2 tsp. salt
– 3 cups frozen blueberries (can also use fresh)
– 1 Tbsp. cornstarch
Preheat your oven to 350F.
In a large bowl, combine the oats, flour, brown sugar, baking soda, and salt. Melt the butter, and pour over the oat mixture. Mix until thoroughly incorporated. Press 2/3 of the oat/butter mixture into a 9×13-inch pan. Reserve the leftover 1/3 for the topping.
In a separate bowl, combine the blueberries, sugar, and cornstarch. Mix well, making sure all the berries are well coated. Pour the berry mixture over the bottom crust, evenly distributing. Sprinkle the remaining oat/butter mixture over the top of the blueberry layer. Bake 25 minutes, but you may need to increase your time. I added on another 20 minutes to my cooking time, since the top was not turning golden brown. So bake 25-45 minutes, or until the top is golden brown.
Remove and allow to cool completely before slicing into bars.