Making Pecan Upside Down Cake is a straightforward process if you follow these steps closely:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C).

2. Prepare the Pan: In a 9-inch round cake pan, pour the melted butter and spread it evenly. Sprinkle the brown sugar over the butter, making sure it covers the bottom.

3. Arrange the Pecans: Lay the pecan halves in a single layer on top of the brown sugar, pressing them gently into the mixture.

4. Mix Wet Ingredients: In a large bowl, whisk together the granulated sugar and eggs until light and fluffy. Stir in the vanilla extract and buttermilk until combined.

5. Add Dry Ingredients: In a separate bowl, combine the flour, baking powder, baking soda, and salt. Gradually add this dry mixture to the wet ingredients, stirring until just combined.

6. Pour the Batter: Carefully pour the batter over the pecans in the pan, ensuring it is distributed evenly.

7. Bake the Cake: Place the pan in the preheated oven and bake for 45-50 minutes, or until a toothpick inserted in the center comes out clean.

8. Cool the Cake: Once baked, remove the cake from the oven and let it cool in the pan for 10-15 minutes.

9. Invert the Cake: Carefully run a knife around the edges of the cake to loosen it. Place a serving plate over the pan and flip it upside down to release the cake. Remove the pan to reveal the pecan topping.

10. Serve Warm: For the best flavor, serve the cake warm, allowing the pecans and caramel to shine.

With these clear instructions, you’ll have a delicious Pecan Upside Down Cake ready to impress.