lost and found — Les Petites Gourmettes

Ingredients

• 2 tablespoons unsalted butter
• 2 medium red onions, peeled and thinly sliced
• 1 teaspoon sugar
• 1/2 ounce dried shiitake mushrooms, re-hydrated in 1 cup boiling water
• 4-ounces cream cheese, room temperature
• Salt and freshly ground black pepper
• 1 cup sour cream
• 1/2 cup packed cilantro leaves
• 1 teaspoon ground cumin
• 1 teaspoon chili powder
• 2 poblano peppers; roasted, peeled, and seeded; divided
• 10 6-inch flour or corn tortillas
• 3 cups shredded sharp white cheddar cheese, divided