Mix together all of the ingredients for the fajita seasoning in a small bowl and set aside.Heat the oil in a large skillet over medium-high heat. Once oil is shimmering, add in the peppers and onions. Season with salt and pepper and cook for 5 minutes or until they soften slightly. Then, add in the tomato paste and stir constantly until paste coats the vegetables. Add in the fajita seasoning and toss again to coat the vegetables. Add in the vegetable broth and let cook for 5 minutes more until the vegetables soften and the moisture makes a sauce.While the vegetables cook, place a small pot over medium-high heat and add in the refried beans. Cook the beans, stirring occasionally, until heated through.Divide the fajitas into plates and top with refried beans and avocado. Garnish with cilantro.