Season chicken with garlic powder, paprika, red pepper flakes, salt, and pepper. Heat oil in a skillet over medium-high.
Cook 6–8 minutes, turning until golden and fully cooked (165 °F / 74 °C). Set aside.
In the same skillet, melt butter over medium heat. Sauté garlic for 1 minute until fragrant. Add broth, bring to a simmer. Stir in rice, cover, and cook on medium-low for 15–20 minutes until tender and broth is absorbed.
Stir in cream and Parmesan until smooth. Season to taste. Add spinach and stir until wilted, about 1 minute.
Return chicken to the skillet. Stir to combine and warm through, letting everything soak up the creamy sauce.