Place bacon in a large skillet and cook over medium high heat, turning occasionally, until evenly browned, about 10 minutes. Drain the bacon slices on paper towels and cool. Chop bacon.
Mix broccoli, bacon, red onion, and raisins in a bowl.
Whisk mayonnaise, sugar, and vinegar together in a bowl; stir dressing into broccoli mixture until evenly coated. Cover bowl and refrigerate for flavors to blend, about 1 hour. Sprinkle salad with sunflower seeds.
Broccoli Raisin Salad · Dinner Match Lab | Dinner Match Lab