Peel and slice onions 1/4 inch thick, then half them, making a half moon shape.
Saute the onions in the butter and oil until carmelized, stirring occasionaly. My stove top it takes about 25 minutes.
Add beef stock, beef base, and seasonings.
Simmer 20 minutes.
Set broiler to high, set rack 6 inches from heat source.
Cut bread to fit your soup crock, toast.
Ladle soup into oven safe crock, top with toast, then 2 slices of swiss cheese.
Broil until cheese is melted and starting to brown.
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