Preheat oven to 375 degrees F (190 degrees C). Butter a 9-inch baking dish.
In a large bowl, stir together the blueberries, sugar, 2 tablespoons flour, cinnamon, and nutmeg. Pour into the prepared baking dish.
In a medium bowl, cut the butter into the 1/2 cup flour, brown sugar, baking powder, baking soda, and salt until mixture resembles coarse crumbs. Stir in the oats. Sprinkle the crumb mixture over the blueberries.
Bake in preheated oven for 40 to 45 minutes, or until topping is lightly browned and blueberry mixture is bubbly.
Interesting Facts
Blueberries are an excellent source of vitamin C, with one cup providing 24 percent of the daily recommended intake.
Blueberries are also rich in antioxidants, which can help protect against cancer and other diseases.
Crumble is a popular British dessert that is similar to a pie, but without the crust.