1-First: preheat the oven to 375°F (190°C) and prepare a muffin pan by greasing it or lining with cups.

2-In a large bowl, stir together all the dry ingredients like flour, baking powder, baking soda, cinnamon, and salt.

3-Next, blend the wet ingredients Greek yogurt, milk, ripe bananas, eggs, spinach, and vanilla extract until smooth in a blender or food processor.

4-Gently combine the wet and dry mixtures with a spatula, taking care not to overmix for fluffy results.

5-If you’re adding optional items like grated sweet potatoes, carrots, or walnuts, fold them in now.

6-Divide the batter evenly into the muffin pan to make about 12 muffins, then bake for 20-25 minutes until a toothpick comes out clean.

7-After baking, let the muffins cool for at least 5 minutes in the pan before moving them to a wire rack.