Place a large pot of water over high heat to cook the pasta. When the water boils, salt it well and drop the pasta in. Cook to al dente according to package directions. Drain the cooked pasta and reserve.
While the pasta is cooking, place a large skillet over medium-high heat with 2 turns of the pan of EVOO, about 2 tablespoons. Season the chicken with salt and pepper, and sear until golden brown, about 5 minutes per side. Remove from the pan and reserve.
Add the onion, bell peppers and garlic to the pan, and cook until the veggies have softened, 7-8 minutes. Season with salt and pepper, and return the chicken to the pan. Add the paprika, allspice and stock to the pan and bring up to a bubble. Simmer until the chicken has cooked through, about 10 minutes more. Remove the pan from the heat and stir in the sour cream. Reserve.