Sauté the onions by melting butter in a skillet over medium heat and adding the chopped onion for 5 minutes until translucent.

Combine the stuffing ingredients by adding diced apple and dried cranberries to the onion mixture and cooking for an additional 3-4 minutes.

Preheat the oven to 375°F (190°C) for even cooking.

Prepare the hens by rinsing, patting dry, and rubbing with olive oil, salt, and pepper.

Stuff each hen with the Apple-Cranberry rice mixture but leave space for expansion.

Cook the hens in the oven for approximately 1 hour until the internal temperature reaches 165°F (75°C).

Rest the hens for 10 minutes before serving.