Heat 1 tablespoon of the oil in a large skillet over medium-high heat. Add the chicken and oregano, and sauté until lightly browned and cooked through. Remove the cooked chicken from the skillet and set aside.
In the same skillet, melt the butter and add the mushrooms, wine and garlic powder and heat over medium. Sauté until the mushrooms are softened.
Cook the pasta according to package directions. Drain the pasta and place in a serving bowl. Toss with the remaining tablespoon of olive oil.
Add the feta cheese, artichoke hearts, bacon, olives and pine nuts. Toss with the pasta, and season to taste with salt and pepper. Serve immediately.