Preheat the oven to 350F.

In a large, oven safe skillet, add the chorizo and italian sausage, breaking into small and medium sized chunks. Cook until almost browned, then add onion. Saute until onion is softened.

Pour in the three cans of beans, barbecue sauce and mustard. Stir together until combined.

Bake in preheated oven for 30 minutes until thickened.