Blueberry Oatmeal Crumble Bars

Kerry made these recently for a dessert at a baby shower and they were a huge hit.

Crust and Crumble Topping:

1/2 cup (1 stick) unsalted butter, melted
1 cup flour
3/4 cup old fashioned whole rolled oats (NOT QUICK)
1/2 cup granulated sugar
1/4 cup light brown sugar, packed
pinch salt, optional and to taste

Blueberry Layer:

12 ounces (2 cups) blueberries (fresh or frozen) 
         Kerry used frozen and didn't thaw.
1/3 cup granulated sugar
2 tablespoons lemon juice
2 teaspoons cornstarch

Directions:

Preheat oven to 350.  Line an 8 inch square pan with aluminum foil and spray with cooking spray; set aside. 

Topping:  In a large bowl melt the butter in the microwave.  Add the flour, oats, sugars, optional salt and stir to combine.  Set 1 heaping cup of crumbly mixture aside to be sprinkled on later.

Place rest of mixture into prepared pan and press to create an even, smooth, flat crust; set aside.

Blueberries:  In a large bowl add all ingredients and toss to combine.
Evenly distribute blueberry mixture over the crust.  Evenly sprinkle with reserved 1 cup crumble topping mixture. 

Bake for 55 minutes or until edges are set and center has just set. 

Cool for at least 30 minutes before slicing and serving. 

Store in refrigerator.