Mushroom Fajitas

Name: Mushroom Fajitas
Ingredients: 1 1/2 lb. portobello mushrooms (about 6 large); 1/4 c. olive oil; 2 tbsp. Worcestershire sauce; 1 tbsp. light brown sugar; 2 tsp. cumin; 2 tsp. kosher salt; 1 tsp. black pepper; 1 tsp. crushed red pepper flakes; Juice of 2 limes, plus wedges for serving; 2 garlic cloves, finely chopped; 12 flour tortillas, warmed; Fresh cilantro, sliced jalapeño, sliced avocado, and salsa, for serving; 1 tbsp. vegetable oil, plus more for the grill; 3 bell peppers (any color), sliced; 1 onion, sliced; 1 tsp. chili powder; 1 tsp. garlic powder; 1 tsp. kosher salt; 1/2 tsp. black pepper