In a small bowl, combine the paprika, dried thyme, garlic powder, 1 tsp dried oregano, ¾ tsp salt, and ¼ tsp black pepper.
Blot the chicken thighs dry with a paper towel, then season both sides liberally with the seasoning blend.
Heat the olive oil and butter in a large deep skillet over medium heat. Once the skillet is hot, add the chicken and cook on each side until golden brown and cooked through (about 5 minutes per side). Remove the chicken from the skillet and transfer to a clean plate. Cover with aluminum foil to keep warm.
In the same skillet, add the diced onion, diced bell pepper, and minced garlic. Sauté for 3-4 minutes until onions are translucent.