Dice the onion into 1/4-inch pieces and mince the garlic cloves—this prep work ensures even cooking and proper flavor distribution throughout the slow cooker. Add the chicken breasts to your slow cooker, then layer in the diced onion, minced garlic, salsa, black beans (drained and rinsed), tomatoes, green chiles, and chicken broth. Sprinkle the chipotle powder, paprika, oregano, salt, and black pepper evenly over everything and stir gently to combine. I prefer to add the spices dry rather than mixing them into liquid first because they distribute more evenly throughout the chicken and create better flavor pockets.
Cover the slow cooker and cook on low for 4 hours. This long, gentle cooking allows the chicken to become very tender while the spices infuse throughout the mixture and the vegetables break down to create a rich, cohesive sauce. The extended time is crucial for layering the flavors properly in a slow cooker.
After 4 hours, carefully remove the chicken breasts from the slow cooker using tongs and place them on a cutting board. Using two forks, shred the chicken into bite-sized pieces—it should pull apart very easily. Return the shredded chicken to the slow cooker and stir it back into the sauce. Add the 2 cups of long-grain white rice and stir well to distribute it evenly throughout the mixture, ensuring the rice is submerged in the liquid.
Cover the slow cooker and cook on low for 45 minutes, stirring once halfway through if possible. The rice will absorb the flavored broth and become tender while remaining distinct grains rather than mushy. I like to stir it midway through to ensure even cooking and prevent the rice on the bottom from overcooking.
Stir in the shredded colby-jack cheese and cover the slow cooker for 3-5 minutes, allowing the residual heat to melt the cheese completely. Stir once more to ensure the cheese is evenly distributed throughout the mixture, creating a creamy, cohesive texture.
Portion the chicken-rice mixture into bowls and set up a toppings bar or add toppings to each bowl as desired. Squeeze fresh lime juice over each bowl first to brighten the flavors, then add dollops of sour cream, olives, and avocado cubes. Finish with a sprinkle of cilantro, sliced green onion, and a drizzle of hot sauce to taste. The lime juice should go on first because its acidity will cut through the richness of the cheese and sour cream while also helping to preserve the avocado's color.