Prep Time: 10 minutes
Cook Time: 35 minutes
Total Time: 45 minutes
1/2 cup cold unsalted butter, cut into pieces
6 cups fresh blueberries
3/4 cup all-purpose flour
3/4 cup brown sugar
1/2 tsp ground cinnamon
1/4 tsp salt
1 1/2 cup rolled oats
Vanilla ice cream, for serving (optional)
Preheat oven to 375 degrees.
Butter a 9x13 inch baking dish and set aside.
Combine the flour, sugar, and cinnamon in a bowl.
Blend in the butter with a pastry cutter or your fingers until the mixture is crumbly.
Place the blueberries in the prepared baking dish and sprinkle the crumb mixture over them.
Bake 30 to 35 minutes.
Serve with vanilla ice cream, if desired.