Cook bacon in a skillet until crispy then chop it into fine pieces.
Thaw the sweet peas and drain well.
Mix peas, bacon, cheddar cheese, and diced onion in a large bowl.
Whisk together sour cream, mayonnaise, sugar, white vinegar, salt, and pepper. Pour over the pea mix and toss well. Chill in the fridge for at least an hour.
Notes
For best results, use thick cut bacon and thaw peas just enough. Enjoy chilled for maximum flavor.