Moist Spinach Muffins

Name: Moist Spinach Muffins
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: American
Ingredients: 2 cups white whole wheat flour (245g) or rolled oats (200g); 1 teaspoon baking powder; 1/2 teaspoon baking soda; 1 teaspoon cinnamon; a pinch of salt; 3/4 cup whole milk plain Greek yogurt (170g); 1/3 cup milk of choice; 2 medium very ripe bananas (240g weighed weighed without peel); 2 eggs; 2 cups loosely packed baby spinach; 1 teaspoon vanilla extract; Optional (for added nutrition and texture): 1/2 cup raw grated sweet potatoes or carrots, see note and/or 1/3 cup finely chopped walnuts; Optional for additional sweetness: (3-4 tablespoons maple syrup, honey, or date syrup)