Step 1: In a large saucepan, melt butter on medium heat. Add mushrooms and onions. Cook till onions are soft.
Step 2: Stir in flour till completely absorbed by butter. Cook about 3 minutes, stirring often to prevent sticking.
Step 3: Add in dry mustard, salt and pepper and stir.
Step 4: Slowly add chicken stock and mix with a large wire whisk as you're pouring stock to prevent lumps.
Step 5: Slowly pour in half & half whisking in.
Step 6: Cook till heated, but not to a boil, stirring often.
Step 7: Serve with grilled cheese sandwiches or some crusty garlic bread.
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