In Old-Texas, the least desired cuts of the butchered steer (referred to as fajita) were offered to the Mexican workers who tenderized these tough parts, grilled and rolled them into tortillas with several other condiments – a delicacy of sorts. Over time, the word fajita meant any meat that was spiced and grilled. Low on carb and high on protein, our Keto Fajita Chicken Casserole isn’t just nutritious but a delicious treat. Diced, spiced and sautéed chicken, mushroom and onions are layered with a tangy tomato sauce, bell peppers, broccoli and mozzarella and baked to give it a glowing golden crust. Serves 1.