How to Make It
Heat oil in a large skillet over medium-high. Add onion, tomatillos, serrano, and garlic. Cook, stirring often, 7 to 8 minutes.
Stir in shrimp, salt, cumin, and chile powder. Cook, stirring often, until shrimp are cooked through, 3 to 4 minutes. Stir in lime juice. Serve in tortillas with toppings.