Slow Cooker Chicken Burrito Bowls

Name: Slow Cooker Chicken Burrito Bowls
Ingredients: 1 lb boneless, skinless chicken thighs (approx. 6); 1 lb boneless, skinless chicken breasts (approx. 2); 1 yellow onion, diced; 1/2 jalapeno, seeded and diced; 1 8-oz can tomato sauce; 1 14.5-oz can diced tomatoes; 2 tsp dried oregano; 2 tsp sea salt; 1 tsp ground black pepper; 1 tsp ground cumin; 1/2 tsp chili powder; 1/2 tsp garlic powder; 1/2 tsp paprika; 1/4 tsp cayenne; For The Cauliflower Rice:; 1 large head cauliflower; 1 tbsp olive oil; 1 1/2 tsp sea salt; 1/2 tsp ground black pepper; For The Chicken Burrito Bowls:; 1 15-oz can black beans, drained; 2 tomatoes, diced; 2 avocados, diced; optional: lime wedges, dollop plain greek yogurt