In a large bowl, combine blueberries, sugar, flour and juice of 1 lemon. Place in a buttered 8- or 9-inch square baking dish.
To make the topping, in a medium bowl, combine butter, brown sugar, flour, oats and cinnamon. Use two forks to blend butter into flour mixture. Mix in pecans. Sprinkle mixture over blueberries.
Bake in a preheated 375-degree oven for 35-40 minutes or until golden and bubbly. Let cool, then serve with Braum’s Homestyle Vanilla Ice Cream.