In a medium skillet over medium heat add 1 tablespoon of butter.Once the butter foams add the diced peppers and onions. Cook, stirring frequently, until the mixture begins to soften, about 1 minute. Add the chili powder, cumin, coriander, and smoked paprika and cook until the spices are very fragrant, about 1 minute. Add the garlic and cook for 30 seconds. Divide the mixture in half, placing one half in the work bowl of a stand mixer and the other half in a medium sized mixing bowl. Allow to cool to room temperature.
In a small bowl combine the beer, water, and yeast. Let the mixture stand until very foamy, about 10 minutes. Pour the yeast mixture into the work bowl with the pepper mixture along with 2 tablespoons of melted butter, flour, salt, and baking powder. Mix with the dough hook for 3 minutes on low speed. Check the hydration - the dough should form a smooth ball that is fairly sticky. Add additional flour if needed to achieve the right consistency. Increase the speed to medium and continue mixing for 5 minutes.
Turn the dough out onto a lightly floured surface and shape into a smooth ball. Place the ball into a bowl that is lightly coated with non-stick cooking spray. Spray the top of the ball lightly, cover and let the dough proof until double in bulk, about 2 hours.
Once the dough has proofed turn it out onto a lightly floured surface. Dust the top of the dough lightly with flour, and with the palm of you hand lightly press out any large air bubble. Roll the dough out into an approximately 18x12-inch rectangle.
Melt the remaining butter and brush half of the melted butter on the dough. Spread over the remaining pepper mixture and both the shredded cheeses. Slice the dough into 8 strips and place the strips into two stacks of four strips each. Cut each stack into 4 equal pieces.
Brush the inside of a 10-inch loaf pan with the melted butter. place the stacks into the buttered pan so the cut sides face up. Pour over any remaining butter, cover, and let rise until the dough holds a finger mark when gently pressed about 1½ hours.
Heat the oven to 350 F. Bake the bread for 25 - 30 minutes, or until the bread is golden brown and sounds hollow when gently thumped on the top. Allow to cool in the pan for 10 minutes before turning out onto a wire rack to cool. Serve warm.
Recipe by Baking and Cooking Blog - Evil Shenanigans at http://www.evilshenanigans.com/2013/02/queso-blanco-pull-apart-bread/