Cook bacon in large skillet until completely cooked; remove and place on paper towel to cool. In the same pan with the bacon grease, carefully add 1 tablespoon of butter (2 if you are being decadent!) and then add chopped onions. Stir onions around until thoroughly coated with the grease/butter. Add cut Brussels sprouts and cook for 3 minutes. Add chicken stock and spices and cook for 10 minutes. There will still be chicken broth left in the pan, which is delicious, so don't think that this all needs to be absorbed.