Creamy Shell Pasta Salad (The One That Gets Better Overnight)

Shell pasta salad is the side dish I reach for when I want something that can sit in the fridge all week and just get tastier.

It’s creamy, tangy, and packed with crunchy celery, sweet bell pepper, and sharp cheddar. The little shells catch every bit of the dressing, and the vegetables stay crisp for days.

What Makes This Shell Pasta Salad So Good

The dressing strikes that balance of creamy and tangy, with just enough vinegar to cut through the richness. Because the shells are tiny bowls, every bite is coated.

The vegetables hold their crunch even after a night in the fridge, and the cheddar adds a salty pop that keeps you going back for more. It’s the kind of salad that frees up your stovetop because it wants to be made ahead.

Ingredients

• 8 oz medium shell pasta: the shape that holds dressing best
• 1/2 cup mayonnaise: full-fat for the creamiest texture
• 1/2 cup sour cream: adds tang and keeps the dressing light
• 2 tbsp apple cider vinegar: gives a mild, fruity sharpness
• 1 tsp Dijon mustard: helps the dressing come together and adds depth
• 1/2 tsp garlic powder
• 1/2 tsp onion powder
• 1/2 tsp salt, plus more for the pasta water
• 1/4 tsp black pepper
• 1 cup diced celery: about 3 crisp stalks, leaves included
• 1 cup diced red bell pepper: about 1 medium, any color works
• 1/2 cup finely diced red onion: soak in cold water 10 minutes to mellow the bite
• 1 cup frozen peas, thawed: no need to cook, just run under warm water
• 1 cup cubed sharp cheddar cheese: small cubes give the biggest flavor payoff
• 1/4 cup chopped fresh dill: optional, but it brightens the whole bowl

Variations / Substitutions

• Make it a main: toss in 1 cup diced cooked ham or shredded rotisserie chicken.
• Change the cheese: swap cheddar for crumbled feta or diced mozzarella pearls.
• Lighten the dressing: replace half the mayo with plain Greek yogurt for a tangier, lighter result.
• Swap the acid: lemon juice or red wine vinegar work in place of apple cider vinegar.
• Add more crunch: a handful of chopped pickles, green olives, or sun-dried tomatoes gives extra bite.

For a more Italian vibe, try my Italian Pasta Salad with salami and pepperoncini.

How to Make Shell Pasta Salad

Step 1: Cook the Shells

Bring a large pot of salted water to a boil. Add the 8 oz shell pasta and cook until al dente, about 8 to 10 minutes.

Drain, then rinse the pasta under cold water until the shells are cool to the touch. Shake off excess water so the dressing will cling and stay creamy instead of getting watery.

Step 2: Whisk the Dressing

In a medium bowl, whisk together 1/2 cup mayonnaise, 1/2 cup sour cream, 2 tbsp apple cider vinegar, 1 tsp Dijon, 1/2 tsp garlic powder, 1/2 tsp onion powder, 1/2 tsp salt, and 1/4 tsp pepper until smooth.

The mixture will look pale yellow and smell tangy. Taste it now and adjust the salt or vinegar—it should be a little sharp since it will mellow over the pasta.

Step 3: Toss the Pasta and Vegetables

In a large bowl, combine the cooled pasta with 1 cup diced celery, 1 cup diced bell pepper, 1/2 cup red onion, and 1 cup thawed peas. Pour the dressing over and toss gently until every shell is glossy and coated.

At first, the dressing will look like a lot, but the shells will soak up the excess as the salad sits. You want the vegetables evenly distributed and the pasta creamy, not dry.

Step 4: Fold in the Cheese and Serve

Add the 1 cup cubed cheddar and 1/4 cup fresh dill (if using) and fold through until the cheese is speckled throughout. If you can, let the salad rest in the fridge for at least 30 minutes—overnight is even better.

Give it a final stir just before serving and top with a little more dill. The cheese adds a salty pop, and the dill makes the whole bowl taste fresh.

A Few Tips Before You Start

• Don’t skip the chill time.: Even 30 minutes lets the flavors come together; overnight turns the pasta silky.
• Use sharp cheddar.: Mild cheddar gets lost in the creamy dressing, so go for the sharpest block you can find.
• Rinse the pasta well.: The starches need to wash off so the shells don’t clump and can hold the dressing loose.
• Season in stages.: Salt the pasta water, add salt to the dressing, and taste the finished salad—cheese adds salt too, so adjust slowly.

How long to chill for best flavor:

Storing Leftover Pasta Salad

• Refrigerate: store in an airtight container for up to 5 days. Stir before serving to redistribute the dressing. If it seems dry, stir in a splash of milk or a spoonful of mayo to loosen it.
• Serve cold: this salad is meant to be eaten straight from the fridge.

What Goes Well With Shell Pasta Salad

This salad goes with almost anything off the grill. Try it alongside grilled chicken thighs marinated in lemon and garlic, or next to a platter of juicy burgers and the creamy dressing cuts right through the richness. It’s just as good with slow-cooked pulled pork or a simple rotisserie chicken on a busy weeknight.

Frequently Asked Questions

Can I use a different pasta shape?

Yes. Rotini or farfalle work well, but medium shells hold the most dressing in their little cups.

Can I make this pasta salad dairy-free?

Absolutely. Use vegan mayonnaise, skip the cheese, or use a dairy-free cheddar alternative. The dressing will still be creamy.

Is it safe to leave out at a picnic?

It’s fine for up to 2 hours at room temperature. After that, return it to a cooler or the refrigerator.

Can I freeze this pasta salad?

No. The dairy dressing will separate upon thawing, and the vegetables will turn mushy.

Shell Pasta Salad Recipe

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 10 minutes mins

Total Time 30 minutes mins

Servings: 8 servings

Calories: 290

Ingredients Method Notes

Ingredients

  

• 8 oz medium shell pasta
• 1/2 cup mayonnaise
• 1/2 cup sour cream
• 2 tbsp apple cider vinegar
• 1 tsp Dijon mustard
• 1/2 tsp garlic powder
• 1/2 tsp onion powder
• 1/2 tsp salt, plus more for pasta water
• 1/4 tsp black pepper
• 1 cup diced celery
• 1 cup diced red bell pepper
• 1/2 cup finely diced red onion
• 1 cup frozen peas, thawed
• 1 cup cubed sharp cheddar cheese
• 1/4 cup chopped fresh dill (optional)

Method

 

1. Cook shell pasta in salted boiling water until al dente, 8 to 10 minutes. Drain, rinse under cold water until cool, and drain well.
2. In a medium bowl, whisk together mayonnaise, sour cream, apple cider vinegar, Dijon, garlic powder, onion powder, salt, and pepper until smooth.
3. In a large bowl, combine cooled pasta, celery, bell pepper, red onion, and peas. Pour dressing over and toss gently to coat.
4. Fold in cheddar and dill. For best flavor, cover and refrigerate at least 30 minutes or overnight. Stir before serving and top with more dill if you like.

Notes

Chill time is not included in the prep or cook time; the salad grows creamier and more flavorful the longer it sits. If it seems dry after a day or two, stir in a splash of milk or an extra spoonful of mayo.