Step 1: Saute onions in butter in large saucepan over low heat for 30 minutes or until tender and transparent.
Step 2: Blend in flour and pepper.
Step 3: Cook over medium heat, stirring until bubbly.
Step 4: Remove from heat and stir in milks, bouillon, bay leaf and stock.
Step 5: Return to heat.
Step 6: Bring to a boil, stirring constantly.
Step 7: Remove bay leaf.
Step 8: Sprinkle with Parmesan cheese.
Step 9: Boil for 1 minute stirring constantly.
Step 10: Season to taste.
Step 11: Place 1 slice French bread and 1 slice Swiss cheese in 8 large oven safe bowls.
Step 12: Pour soup over bread and cheese.
Step 13: Place bowl in broiler until cheese melts (or toast bread before hand in air fryer or toaster before you pour soup over it).
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