Preheat the oven to 400 degrees Fahrenheit.
In a large oven-safe skillet, heat the olive oil over medium heat. Add the diced onion and sauté for 5 minutes, or until soft.
Add the minced garlic, diced red bell pepper, chopped kale, dried oregano, red pepper flakes, and kosher salt. Sauté for another 5 minutes, or until the kale is wilted.
Stir in the tomato paste and sauté for 1-2 minutes until fragrant.
Add the uncooked orzo and 2 cups of chicken broth. Stir to combine and bring to a simmer.
Transfer the skillet to the preheated oven and bake for 10-15 minutes, or until the orzo is tender and has absorbed most of the liquid.
Remove from oven. Stir in 2 tablespoons of butter, crumble 1/2 cup feta cheese over the top, and dust with fresh dill, a squeeze of lemon juice, and freshly ground black pepper. Enjoy!