For the frosting: Cook the bacon, over medium heat in a small skillet, until crisp. Transfer to a plate lined with paper towels to drain and cool, then chop and set aside. Combine the remaining ingredients, except the scallions, in a medium bowl and mix well. Refrigerate for 2 hours.;
For the batter: Preheat oven to 375 degrees F.
In a large bowl add the flour, cornmeal, sugar, eggs, buttermilk and 3 tablespoons melted butter. Mix well to combine.
Saute onions and jalapenos using 1/4 tablespoon butter, about 2 minutes. Add salt, pepper and chiles. Remove from heat, cool slightly and add to the batter.
Spray 2 (12 capacity) muffin pans with nonstick spray. Fill the pans 3/4 full with the batter. Bake for 12 to 15 minutes until golden. Let cool and frost with pimento cheese mixture. Garnish with chopped bacon and chopped scallions.
Neelys BBQ Seasoning:
Mix all ingredients together and store in an airtight container for up to 3 months.