Follow these easy steps to create your Pecan Upside Down Cake:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9-inch round cake pan.
2. Prepare the Topping: In a medium saucepan, melt ½ cup of butter over low heat. Stir in the brown sugar until dissolved. Remove from heat.
3. Add Pecans: Arrange the pecan halves in the bottom of the greased cake pan, then pour the butter-brown sugar mixture over them evenly.
4. Mix Dry Ingredients: In a large bowl, whisk together the flour, baking powder, baking soda, and salt.
5. Cream Butter and Sugar: In another bowl, beat the remaining ½ cup of butter and granulated sugar together until light and fluffy.
6. Add Eggs and Vanilla: Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
7. Combine Mixtures: Gradually add the dry ingredients to the butter mixture, alternating with buttermilk. Mix until just combined.
8. Pour Batter: Carefully pour the cake batter over the pecans in the pan, spreading it evenly.
9. Bake: Place in the preheated oven and bake for 35-40 minutes, or until a toothpick inserted in the center comes out clean.
10. Cool: Allow the cake to cool in the pan for about 15 minutes. Then, invert it onto a serving platter while still warm.

By following these steps, you can create a stunning and delicious Pecan Upside Down Cake that will delight everyone!