Preheat oven to 350 degrees F.
Spray baking pan with cooking spray - can use 9 inch springform pan or 13x9 baking dish.
In a large bowl, cream butter until light and fluffy.
Add sour cream, vanilla extract and chia seed mixture, cream until well combined.
Add zest and juice, mix well.
In a medium bowl, whisk together flour, sugar, baking powder, baking soda and salt.
Gradually add dry ingredients to wet ingredients, reserve 1-2 teaspoons of dry ingredients.
In a small bowl, add blueberries and reserved flour mixture and toss to coat. This will help prevent the blueberries from sinking to the bottom while cooking.
Gently fold blueberries into mixture, being careful not to break the berries.
Spread evenly into prepared pan.