cream of mushroom soup

Ingredients

• 2 large enoki mushrooms, washed and sliced
• 1 large portobello mushroom
• 2 large king oyster mushrooms, washed and sliced
• 12 large shiitake mushrooms, washed and sliced
• 6 large cremini mushrooms, washed and sliced
• 1 tablespoon olive oil
• 4 tablespoons butter, divided
• 2 cups yellow onions, sliced and halved
• 1/2 teaspoon ground himalayan sea salt
• freshly ground black pepper, to taste (i always use mixed peppercorns)
• 3 tablespoons unbleached all-purpose flour
• 2 cups 35% heavy cream
• 2 cups milk
• 2 ounces cooking sherry
• 1 teaspoon dried basil
• 1/2 teaspoon ground thyme
• 1/8 teaspoon cayenne pepper, or more to taste