Classic Pea Salad

Ingredients
1/2 cup sour cream
1/2 cup mayonnaise
1 tablespoon granulated sugar
1 tablespoon apple cider vinegar
1/2 teaspoon salt, plus more to taste as needed
4 cups frozen peas, thawed
8 slices bacon, cooked and crumbled
1/2 medium red onion, diced