Peel & finely chop garlic. Rinse rice until water runs clear. Heat a drizzle of oil in a pot over medium-high heat. Add garlic & cook until fragrant. Stir in rice, stock concentrate, water, turmeric, and salt. Bring to a boil, then cover and reduce heat to low. Cook until rice is tender, 15 minutes.
Halve, peel, and thinly sliced onion. Core, deseed, and dice green pepper.
Heat a drizzle of oil in a pan over medium-high heat. Add onion and green pepper; cook until softened and lightly charred. Season with salt and pepper.
Add chicken to pan and season with Southwest spice. Cook until chicken is browned and cooked through.
In a small bowl, combine sour cream and hot sauce to taste. Add water 1 tsp at a time until mixture reaches a drizzling consistency. Season with salt and pepper.
Fluff cooked rice with a fork; stir in butter and season with salt and pepper. Top with chicken and veggies mixture. Drizzle with Crema.