Blueberry oat bars

Ingredients

• 1 cup walnuts coarsely chopped
• 1 1/2 cups all purpose flour
• 1 1/4 cups old fashioned oats
• 1/3 cup granulated sugar
• 1/3 cup packed brown sugar
• 1 tsp salt
• 1/2 tsp baking soda
• 1 1/2 sticks butter
• 1 cup blueberry preserves
• 1 packet blueberries