Heat a large nonstick skillet over medium-high heat. Add 1 teaspoon oil to pan; swirl to coat. Add half of chicken; cook 4 minutes, turning to brown on all sides. Remove chicken from pan; place in a large bowl. Repeat procedure with 1 teaspoon oil and remaining chicken. Add to bowl. Place remaining 1 teaspoon oil, onion, and chorizo in pan; cook 10 minutes or until onion is tender and golden, stirring occasionally. Add garlic and bell pepper; cook 2 minutes, stirring frequently. Add chorizo mixture, cooked rice, peas, and olives to chicken; toss to combine.
Combine milk and next 5 ingredients (through black pepper) in a medium saucepan over medium heat; stir well with a whisk. Cook, stirring constantly, until mixture comes to a boil; cook 1 minute or until thick and bubbly. Remove pan from heat; stir in sour cream. Add sour cream mixture to chicken mixture, stirring to combine. Spoon the chicken mixture into an 11 x 7-inch glass or ceramic baking dish coated with cooking spray. Cover with aluminum foil coated with cooking spray. Bake at 375° for 15 minutes. Uncover and bake an additional 10 minutes or until chicken is done.
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