In a large pot filled with boiling water, dissolve the bouillon cubes and cook the noodles according to package directions. Drain the noodles in a colander and then nestle the colander into the pot so some of the pasta water goes into the pot as the pasta continues to drain. Remove the colander and stir the butter and sour cream into the pot until the butter melts. Add the parsley and the noodles. Season with salt and pepper. Toss to combine well. Pour into a serving bowl and serve.