This is a recipe adapted from a blueberry recipe I found on a site called Brown Eyed Baker and it came out great and I wanted to share it. The directions are the same I just made a few changes to the ingredients.
Preheat the oven to 350 degrees F*. Grease a standard 12-cup muffin tin (or line with paper liners) and set aside.
Whisk the flour, baking powder and salt in a medium bowl until combined. Whisk the egg in a separate medium bowl until well-combined and light-colored, about 20 seconds. Add the sugar and whisk vigorously until thick, about 30 seconds. Add the melted butter in 2 or 3 additions, whisking to combine after each addition. Add the yogurt in 2 additions, whisking just to combine.
Add the peaches to the dry ingredients and gently toss just to combine. Add the sour cream mixture and fold with a rubber spatula until the batter comes together and the peaches are evenly distributed, 25 to 30 seconds. Small spots of flour may remain and the batter will be very thick. Do not overmix.
Using a large spoon or a cookie scoop sprayed with nonstick cooking spray, divide the batter amount the muffin cups. Bake until the muffins are light golden brown and a toothpick or thin knife inserted into the center of a muffin comes out clean, 25 to 30 minutes, rotating the pan from front to back halfway through the baking time. Immediately remove muffins to a wire rack and cool for at least 5 minutes. Serve immediately or at room temperature. Store leftovers in an airtight container at room temperature.