Preheat oven to 350
Either: Dice bacon, then cook, or cook bacon, then chop into bite-size pieces. Set aside to drain. (optional: you can use the bacon grease instead of the butter to saute the vegetables in the next step)
Melt butter in large saucepan over medium heat. Saute onion, celery, and peppers until soft. Stir in flour, then sour cream until thoroughly mixed. Finally, add corn and the bulk of the bacon and season with salt and pepper.
Pour into 9" x 13" glass baking dish and sprinkle on remaining bacon and parsley.
Bake for 30 to 45 minutes, until lightly browned.