Aunt Betty's Blueberry Muffins

In a large bowl, combine oats and orange juice; let stand for 5 minutes. Beat in the egg, oil and sugar until blended. Combine the flour, baking powder, salt and baking soda; stir into oat mixture just until moistened. Fold in blueberries. , Fill greased or paper-lined muffin cups two-thirds full. Combine topping ingredients; sprinkle over batter. Bake at 400° until a toothpick inserted in the center comes out clean, 20-25 minutes. Cool for 5 minutes before removing from pan to a wire rack. Serve warm.