Blueberry Crumble

2 pints fresh blueberries
1 cup sugar, divided
2 Tbsp. fresh lemon juice
4 Tbsp. butter
2/3 cup flour
1 packet flavored instant oatmeal
Cinnamon and cinnamon sugar

Grease square baking pan and preheat oven to 350 degrees. Spread blueberries in bottom of pan. Sprinkle with lemon juice, cinnamon, and 2/3 cup sugar. In separate bowl, combine flour, contents of oatmeal packet, and softened butter. Mixture should resemble small crumbs. Spread over blueberries. Sprinkle top with cinnamon sugar. Bake for 30 minutes or until browned and bubbly. Serve warm with Cool Whip or Vanilla Ice Cream.