Season chicken generously with salt and black pepper on all sides.In a large skillet over medium-high heat, heat the oil.
Sear each breast, sides, and underside of the cornish hens until golden brown.
Return skillet to medium heat and add garlic, thyme, basil, onion powder, paprika, and red pepper flakes. Cook until fragrant, 1 minute.
Then pour the sauce over the hens in the slow cooker. Set the slow cooker on high power or 3 hours or low for 5 hours.
Serve with mashed potaotes or over rice.