Simple Blackened Salmon With Spinach Rice

Name: Simple Blackened Salmon With Spinach Rice
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: American
Ingredients: 1 tablespoon olive oil; 1 cup yellow onion (small dice); ½ teaspoon kosher salt; 4 cups fresh spinach (chopped); 2 cups long grain white rice; 2 ⅔ cup chicken broth; 4 six ounce salmon filets (skin removed); 2 tablespoons paprika; ½ teaspoon cayenne pepper; ½ teaspoon dried oregano; ½ teaspoon dried thyme; ½ teaspoon garlic powder; 1 ½ teaspoon kosher salt; 4 tablespoons unsalted butter; 1 lemon; Lemon wedges (chopped parsley, and/or feta cheese for garnish)