Creating delectable Nectarine Muffins can be simple if you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Line a muffin tin with paper liners or grease it with cooking spray.
2. Mix Dry Ingredients: In a large bowl, combine the flour, sugar, baking powder, baking soda, and salt. Stir well to ensure even distribution.
3. Combine Wet Ingredients: In another bowl, whisk together the buttermilk, vegetable oil, eggs, and vanilla extract until fully combined.
4. Combine Mixtures: Pour the wet ingredients into the dry ingredients. Stir gently until just combined; do not overmix.
5. Add Nectarines: Carefully fold in the diced nectarines, ensuring they are evenly distributed throughout the batter.
6. Fill Muffin Tin: Divide the batter evenly among the muffin cups, filling each about ⅔ full.
7. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes, or until a toothpick inserted in the center comes out clean.
8. Cool: Once baked, remove the muffins from the oven and allow them to cool in the pan for about 10 minutes. Then, transfer them to a wire rack to cool completely.

These steps will guide you in creating mouthwatering Nectarine Muffins that everyone will love!