Blackened Baja Tilapia Tacos

Name: Blackened Baja Tilapia Tacos
Ingredients: 1 Cup basmati rice; 2 Tablespoons salted butter; 1/2 Cup chopped cilantro, plus three sprigs for garnish; Salt and pepper, to taste; 1 1/2 Teaspoon paprika; 1 1/2 Teaspoon brown sugar; 1 Teaspoon chili powder; 1 Teaspoon cumin; Pinch of red pepper flakes; 1 clove garlic, finely minced; 1 Tablespoon olive oil; One 1/2-pound tilapia fillet; 2 mini flour tortillas; 4 lime wedges, for garnish; 1/2 avocado, thinly sliced; Sour cream, for garnish