Preheat the oven to 350 F and grease an 8" square pan.
In a small bowl, mix the dry ingredients together.
In a medium bowl, beat the buttermilk, butter and eggs together.
Add the dry ingredients to the wet and stir just until mixed together. Don't overmix.
Pour the batter into the greased pan and smooth out the top a bit after you've scraped the bowl with a spatula.
Place on the middle shelf in your oven and bake 35-40 minutes, until cooked through. Test by poking a wooden toothpick through the center and pulling it back out. It should come out clean!