This 3-ingredient French onion dip is the kind of no-fuss classic my dad makes for every single cookout. It’s the one everyone hovers around, chip in hand, and it disappears so fast we’ve learned to make a double batch before guests even ring the doorbell. This version leans on the midwestern pantry staple combo of dry onion soup mix and sour cream, a shortcut that dates back to the 1950s when home cooks started stirring soup packets into dairy to mimic the slow-cooked French onion flavor. The result is thick, creamy, and packed with savory onion and a hint of beefy depth—perfect for casual gatherings when you want maximum payoff with minimal effort.
Serve this French onion dip well-chilled in a clear glass bowl so the creamy white base and dark brown flecks of dehydrated onion are visible. Pair it with sturdy potato chips, ridged if you have them, plus a platter of raw vegetables like carrot sticks, celery, bell pepper strips, and snap peas. It’s also great with pretzels, pita chips, or spread on burgers and grilled chicken sandwiches instead of mayo. For a full cookout spread, set it next to grilled brats, burgers, and corn on the cob so guests can use it as both a dip and a quick sauce.
3-Ingredient French Onion DipServings: 8
Ingredients
2 cups (16 ounces) full-fat sour cream
1 packet (1–1.2 ounces) dry French onion soup mix
1/4 cup mayonnaise (preferably full-fat)
Directions
In a medium mixing bowl, add the sour cream and mayonnaise. Stir together until the mixture is completely smooth and evenly combined. This creates a rich, creamy base that will hold the onion soup mix without becoming too thick.
Sprinkle the dry French onion soup mix evenly over the creamy base. Using a spatula or spoon, fold and stir until all the dry mix is fully incorporated and no streaks of powder remain. You should see dark brown flecks of dehydrated onion evenly distributed throughout the dip.
Taste the dip. The soup mix is usually salty enough on its own, so avoid adding extra salt at this stage. If you prefer a slightly looser dip, you can thin it with a tablespoon or two of milk or cream, stirring well after each addition until you reach your desired consistency.
Transfer the dip to a clear glass serving bowl so you can see the thick, creamy texture and the onion flecks through the sides. Smooth the top with the back of a spoon for a neat presentation.
Cover the bowl tightly with plastic wrap and refrigerate for at least 1 hour, or up to 24 hours, before serving. This resting time allows the dehydrated onions and seasonings to fully hydrate and bloom, deepening the flavor and slightly thickening the dip.
When ready to serve, give the dip a quick stir to redistribute any settled seasonings. Serve chilled with potato chips and fresh vegetables. Keep the bowl on ice or return it to the refrigerator after 2 hours if serving outdoors in warm weather.
Variations & Tips
For a lighter version, swap half of the sour cream for plain Greek yogurt; this keeps the dip thick and tangy while cutting some richness. If you like a stronger onion flavor, stir in 1–2 tablespoons of finely minced fresh chives or green onions just before serving for a fresh, grassy note. For a touch of sweetness and depth, you can fold in 2–3 tablespoons of finely chopped, well-cooled caramelized onions along with the soup mix (this technically adds more than three ingredients, but the base recipe remains the same). If you prefer a smoother, more mellow dip, let it rest overnight; the dehydrated onions will fully soften and the flavors will meld. Food safety tips: Always keep the dip refrigerated until serving, and limit the time it sits at room temperature to 2 hours (or 1 hour if it’s above 90°F/32°C) to reduce the risk of bacterial growth in the dairy. If serving at a long cookout, transfer small portions to the table and replenish from a chilled container rather than leaving the entire batch out. Discard any leftover dip that has been left out beyond safe time limits, and store properly chilled leftovers in an airtight container for up to 3–4 days.
