About 15 minutes before serving, stir in the cooked bowtie pasta to coat it evenly with the creamy sauce. Let it warm through in the crockpot. Serve hot, garnished with fresh parsley if desired.

In a large pot, melt 1 tablespoon of butter. Add the garlic, mushrooms and onion. Season with salt and pepper and sauté until the mixture begins to brown and become fragrant, about 8 minutes.