Flax seeds and blueberry cookies

Directions

1. Preheat oven at 180⁰C (350⁰F);
2. Mix together yogurt, milk and vinegar in a small mixing bowl; let rest for a few minutes;
3. Meanwhile, mix together sugar, egg, lemon zest and margarine with a wooden spoon. Keep aside;
4. In a third bowl, mix together dry ingredients (flour, flax seeds, baking soda and baking powder), keep aside;
5. Combine milk mixture and margarine and sugar mixture, with a wooden spoon. It will have a curdy look, but it is normal;
6. Combine with dry ingredients, stir until smooth, no more;
7. Add in blueberries, mix in well;
8. Drop dough by rounded tablespoonfuls on two cookie sheets lined with parchment paper;
9. Bake for 15 minutes or until golden brown.