chicken pad thai

I thought I had shared this recipe, but apparently not. I will now! This is a favorite of ours! We eat it all the time!!!
1 (12 ounce) package rice noodles or 4 packages of ramen noodles
2 tablespoons butter
1 pound boneless, skinless chicken breast halves, cut into bite-sized pieces
1/4 cup vegetable oil
1 tablespoon white wine vinegar
2 tablespoons fish sauce
3 tablespoons white sugar
1/8 tablespoon crushed red pepper
2 cups bean sprouts (optional)
1/4 cup crushed peanuts
3 green onions, chopped
1 lemon, cut into wedges

For rice noodles: Soak rice noodles in cold water 30 to 50 minutes, or until soft. Drain, and set aside.
For Ramen noodles: Cook as directed. Throw away flavor packets.
Heat butter in a wok or large heavy skillet. Saute chicken until browned. Remove, and set aside.
Add softened noodles, and vinegar, fish sauce, sugar and red pepper. Adjust seasonings to taste. Mix while cooking, until noodles are tender. Add bean sprouts, and mix for 3 minutes.
Garnish with crushed peanuts, chopped green onions and wedge of lemon.