I'm reposting this from Simply Recipes with additional notes of how I did it. Italics are mine.
1 5-pound roasting chicken, cut into serving pieces (I used 5 boneless, skinless chicken breast halves)
Flour, salt and pepper
1 cup grapeseed oil, or canola oil (I used canola, and only about 1/2 cup since I didn't have as much chicken)
1/4 cup rich chicken broth
1 small onion, chopped
1/2 pound fresh mushrooms, sliced (I used baby portabellas, NOM!)
1 clove of garlic, crushed
1/2 cup sour cream
1/2 cup heavy cream
Salt and pepper
1 Put a cup of flour, a teaspoon of salt and half a teaspoon of pepper in a brown paper bag. Piece by piece, put a piece of chicken in the bag and shake to coat the chicken with flour mixture.
2 Preheat the oven to 350°F. On the stovetop, in a large frying pan, heat oil to medium high heat. Place the chicken pieces in the pan. Watch the oil carefully, you don't want the oil to be so hot as to burn the chicken, you just want to lightly brown it. Brown the chicken pieces on all sides, turning when necessary.
3 Butter a roasting pan generously. Arrange the chicken pieces in it, pour broth over it, and bake at 350°F until the chicken is tender and cooked, about 40-50 minutes for pieces from a 5-pound chicken. You know that the chicken is done by poking a thigh with a meat fork (the thigh meat is dark meat and takes longer to cook than white breast meat). If pink or red juice runs out of the hole made by the fork, the chicken is not done. If only clear juice runs out, the chicken is done. (Since I used the boneless, skinless chicken, it only took about 20 minutes, the time it took me to make the rest of it, to cook through)
4 About 20 minutes before the chicken is expected to be done, start cooking the onions and mushrooms. In the same frying pan as was used to cook the chicken, empty the pan of all but 2 Tbsp of oil. Add the onions to the pan and sauté on medium heat until softened. Add the crushed garlic clove and the mushrooms and cook until mushrooms are no longer crisp. Remove and discard the garlic, and add the sour cream and the heavy cream to the onions and mushrooms. Lower the heat. Keep warm, but do not boil. Salt and pepper to taste. (I lost the garlic clove in there, so it stayed in)
5 When the chicken is done, remove from oven. Serve on a platter with the mushroom sauce spooned over it, or served on the side.
Serves 6 to 8.
Serve with noodles, rice, or Spanish Rice. (I lightly sauteed several large handfuls of baby spinach in just a little olive oil and served the chicken and sauce over that, with a large slice of sourdough bread on the side)