Bakery Style Apple Butter Muffins

Name: Bakery Style Apple Butter Muffins
Prep time: 5 min
Cook time: 19 min
Total time: 24 min
Cuisine: American
Ingredients: 2 1/2 cups (300g) whole wheat flour; 1 1/2 tbsp (8g) ground flaxseed; 1 tsp ground cinnamon; 1/2 tsp ground nutmeg (fresh if possible); 2 tsp baking powder; 1/2 tsp baking soda; 1/4 tsp salt; 2 large eggs; 1/2 cup (90g) brown sugar, packed; 1 cup (240g) apple butter; 1/3 cup (60g) canola oil; 1 cup (220g) unsweetened oat milk (or milk of choice); 1/4 cup (55g) plain nonfat Greek yogurt; 1 tsp vanilla extract; 1 tbsp turbinado sugar (optional, to sprinkle on top)