Rinse the Cornish Hens, including the cavity. Dry with paper towel, set aside.
In a bowl, combine the buttermilk, fresh garlic, paprika, chili powder, oregano, onion powder, rosemary, thyme, salt, and pepper.
Place the Cornish Hens in the seasoned buttermilk, cover with plastic wrap and place in the fridge for a minimum of 2 hours.
Preheat the oven to 425 degrees.
Pat dry the Cornish Hens, to remove the excess buttermilk and let them come to room temperature
Place the Cornish Hens on a roasting pan, cover with aluminum foil and cook for 1 hour and 15 minutes or until they're fully cooked through.
The final 15 minutes uncovered.
Brush with a little butter and Enjoy!