I'm making jalapeno cornbread using a recipe I found on simplyrecipes.com. It's the kind that's baked in a cast iron skillet. The ingredients are: 1 cup cornmeal, 1 cup flour, 2 teaspoons baking soda, 1/2 teaspoon salt, 3/4 cup plain yogurt (I'm substituting sour cream), 1/2 cup milk, 1 egg, 5 Tbsp melted butter, chopped jalapenos, 1/2 cup corn and 1/2 cup grated Monterey jack). I wasn't reading carefully enough, and I put in baking powder instead. I've already stirred together the dry ingredients, so my only choices are continuing with what I've done or wasting flour and cornmeal. Is this a fatal error? Is it likely to make the bread rise too high and spill over the sides of the pan in the oven? Does it make any difference that I'm using sour cream instead of yogurt? I haven't added any wet ingredients yet, so I'm open to modifying them if that would help.