Start by blending tomatoes, oregano, chipotle pepper, vegetable broth, and salt until smooth. This smoky sauce is the heart of the dish and gives the mushrooms all their flavor.
Heat oil in a skillet and sauté mushrooms with salt and pepper until golden brown, about 6–8 minutes. Add onions and cook until softened, then garlic for one minute. Pour in the sauce and simmer on low for 13–15 minutes until thickened.
Warm the tortillas briefly, then place 1 tablespoon of mushroom filling in each. Roll tightly, seam-side down, to prevent unrolling while cooking.
Preheat the air fryer to 385°F. Arrange the flautas on the crisper plate, seam-side down, and cook for 7–8 minutes until golden and crispy.
Top the crispy flautas with shredded lettuce, diced tomatoes, thinly sliced red onion, and almond crema. Serve immediately for the best texture.