Stuffed Sweet Potatoes with Beans and Guacamole

Name: Stuffed Sweet Potatoes with Beans and Guacamole
Ingredients: 2 medium sweet potatoes (about 9 ounces each); 2 tablespoons melted virgin coconut or vegetable oil, divided; 1 teaspoon kosher salt, divided; 1/2 teaspoon cayenne pepper, divided; 1/2 teaspoon ground cumin, divided; 1 red onion, coarsely chopped; 2 garlic cloves, finely chopped, divided; 1 (15.5-ounce) can black beans, rinsed, drained; 3/4 cup vegetable broth; 1 ripe avocado; 3 tablespoons chopped cilantro, divided; 2 tablespoons fresh lime juice, divided; 2 cups baby spinach (about 2 ounces); 1 ounce crumbled queso fresco (about 1/4 cup); Tortilla chips (optional; for serving)