Blueberry Flax Muffins

Name: Blueberry Flax Muffins
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: American
Ingredients: 2 1/4 cups (270g) whole wheat flour; 1/3 cup (27g) ground flaxseed; 2 1/2 tsp baking powder; 3/4 tsp baking soda; 2 tsp ground cinnamon; 1/2 tsp ground nutmeg; 1/4 tsp salt; 2 large eggs; 1/2 cup (160g) maple syrup; 1/3 cup (60g) canola oil; 1/2 cup (110g) plain nonfat Greek yogurt; 1 cup (220g) unsweetened oat milk; 2 tsp vanilla extract; 1 1/4 cups (160g) wild blueberries (fresh or frozen); Zest from 1 lemon (optional); 1 tbsp lemon juice (optional); 1 tbsp turbinado sugar (optional for topping)