1-Preheat the oven and prep the pan: Preheat the oven to 350°F (175°C) and line a 12-cup muffin pan with paper liners or grease the cups.

2-Prepare the peaches: If desired, peel and chop peaches into 1/2 inch cubes to get 2 cups (peeling optional).

3-Combine dry ingredients: In a large bowl, whisk together flour, sugar, baking powder, baking soda, salt, and cinnamon.

4-Combine wet ingredients: In a separate bowl, whisk egg, milk, melted butter, and vanilla until smooth.

5-Make the batter: Pour wet ingredients into dry ingredients and stir gently with a spatula just until combined (batter will be thick and slightly lumpy); do not overmix.

6-Add the peaches: Gently fold in the chopped peaches, and any optional nuts or dried fruit.

7-Fill the muffin cups: Divide the batter evenly among the muffin cups, filling each about two-thirds full.

8-Bake the muffins: Bake for 18 to 22 minutes at 350°F (or at 375°F, reducing time slightly) until tops are golden and a toothpick inserted into the center comes out clean or with a few moist crumbs.

9-Cool the muffins: Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.