Melt butter with oil in a Dutch oven over medium heat. Add white onion and next 7 ingredients, and sauté 8 minutes or until translucent. Add garlic, and cook 30 seconds.
Stir in beans and beer, and cook 5 minutes or until liquid is reduced by half. Add chicken and broth; bring to a boil over high heat. Reduce heat to medium-low, and simmer 30 minutes until thickened. Serve with desired toppings.
Note: We tested with Blue Moon Belgian White Wheat Ale.