Simple Dijon Tuna Stuffed Mini Peppers

I never thought to pair tuna with mini peppers until I saw my neighbor doing it at a block party last summer. Growing up, tuna meant sandwiches with mayo and celery, period. That’s just how mom made it, and I never questioned it.

But watching those little peppers disappear from my neighbor’s platter made me realize I’d been stuck in a tuna rut. These stuffed mini peppers are so different from the basic sandwich – they’re fresh, light, and honestly, way more fun to eat. Plus, they’re pretty much impossible to mess up, which makes them perfect for busy weeknight dinners or last-minute get-togethers.

What Kind of Mini Peppers Should I Use?

Sweet mini peppers, which usually come in bags of red, orange, and yellow varieties, are perfect for this recipe. These small, colorful peppers are milder and sweeter than their larger bell pepper cousins, making them ideal for stuffing. You’ll want to look for peppers that are firm, bright in color, and about 2-3 inches long – avoid any that feel soft or have dark spots. While red mini peppers tend to be the sweetest, any color will work great for this recipe, and using a mix of colors makes for a pretty presentation. Just make sure to pick peppers that are similar in size so they’ll cook evenly.

Options for Substitutions

This easy appetizer recipe is super adaptable! Here are some simple swaps you can try:

• Mini peppers: If you can’t find mini peppers, you can use regular bell peppers cut into quarters, or even hollow out cherry tomatoes or cucumber rounds for a different twist.
• Tuna: Not a tuna fan? Try using canned salmon, chicken, or even mashed chickpeas for a vegetarian version. Just make sure to drain well before mixing.
• Mayonnaise: Greek yogurt or mashed avocado can replace mayo for a healthier option. If using yogurt, you might want to add a tiny bit more salt to taste.
• Red onion: Feel free to swap with green onions, shallots, or even celery for crunch. If you’re not big on raw onion, try using onion powder instead.
• Parsley: Any fresh herbs work well here – try dill, chives, or cilantro. Dried herbs can work too, just use 1 teaspoon instead of 1 tablespoon.
• Cheese: As mentioned in the recipe, any melty cheese works great – try provolone, monterey jack, or even pepper jack for a spicy kick.

Watch Out for These Mistakes While Cooking

The biggest challenge when making stuffed mini peppers is cutting them incorrectly – always slice them lengthwise and remove the seeds carefully to create perfect boats for your tuna mixture, without breaking the peppers. A common error is not draining the tuna well enough, which can make your filling watery and cause it to slide right out of the peppers, so take extra time to press out all excess liquid. To prevent your peppers from becoming too soft or mushy, avoid overcooking them – they should still have a slight crunch when done, typically taking just 10-12 minutes in the oven at 375°F. For the best flavor and texture, let the stuffed peppers rest for 3-5 minutes after baking, which allows the cheese to set slightly and makes them easier to handle without burning your mouth.

What to Serve With Tuna Stuffed Mini Peppers?

These tuna stuffed mini peppers make a great appetizer or light lunch, and there are lots of easy ways to round out the meal. A simple green salad with lemon vinaigrette pairs perfectly, keeping things light and fresh while adding some extra crunch. If you’re serving these for lunch, try adding some crusty bread on the side to make it more filling, or serve them alongside some cucumber slices and cherry tomatoes for an easy no-cook side dish. For a heartier meal, you could pair them with a cup of tomato soup or even some quick-cooking quinoa tossed with fresh herbs.

Storage Instructions

Keep Fresh: These tuna stuffed mini peppers are best enjoyed within 2 days when stored in an airtight container in the fridge. The peppers might get a bit softer over time, but they’ll still taste great! I like to prep these the night before for an easy lunch option.

Make Ahead: Want to prep these in advance? You can make the tuna filling up to 2 days ahead and store it separately in the fridge. When you’re ready to eat, just stuff your peppers and pop them in the oven. This way, your peppers stay crisp and fresh!

Leftovers: If you have any leftover stuffed peppers, they’re actually pretty good cold straight from the fridge. But if you prefer them warm, just pop them in the microwave for 30-45 seconds or until heated through. The cheese won’t be as melty as fresh from the oven, but they’ll still be tasty!

Preparation Time	10-15 minutes
Cooking Time	5-10 minutes
Total Time	15-25 minutes
Level of Difficulty	Easy

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 500-600
• Protein: 40-45 g
• Fat: 30-35 g
• Carbohydrates: 20-25 g

Ingredients

For the tuna filling:

• 1 tsp Dijon mustard (adds sharp, tangy flavor)
• 1 tbsp fresh parsley (freshly chopped for best flavor)
• black pepper (freshly ground preferred)
• 1 can tuna (I use StarKist solid white)
• 2 tbsp mayonnaise (for creamy, rich texture)
• salt (to taste)
• 2 tbsp red onion (finely chopped, about 1/4-inch pieces)

For assembly and baking:

• 8 small sweet peppers (about 2-3 inches long, halved lengthwise)
• 1/3 cup cheddar cheese (shredded, for melting on top)

Step 1: Prepare the Peppers

• 8 small sweet peppers

Preheat your oven to 350°F.

While it heats, rinse the sweet peppers and carefully cut each one in half lengthwise.

Use a small spoon or your fingers to remove the seeds and white membrane from each half, creating a clean cavity for the filling.

Arrange the pepper halves cut-side up on a baking sheet—this is your canvas for assembly.

Step 2: Make the Tuna Filling

• 1 can tuna
• 2 tbsp mayonnaise
• 1 tsp Dijon mustard
• 2 tbsp red onion
• 1 tbsp fresh parsley
• salt
• black pepper

Drain the canned tuna thoroughly and add it to a small bowl.

Stir in the mayonnaise, Dijon mustard, finely chopped red onion, and fresh parsley until everything is evenly combined.

Season with salt and freshly ground black pepper to taste.

I like to taste a small spoonful before filling—this is your chance to adjust the seasoning, so don’t skip it.

Step 3: Fill and Top the Peppers

• tuna filling from Step 2
• 1/3 cup cheddar cheese

Using a small spoon, divide the tuna mixture evenly among the pepper halves, mounding it slightly in the center of each one.

Once all peppers are filled, sprinkle the shredded cheddar cheese generously over each pepper.

I find that mounding the cheese a bit helps it get extra melty and creates a nice golden top.

Step 4: Bake and Finish

• filled and topped peppers from Step 3

Place the baking sheet in the preheated 350°F oven and bake for about 5 minutes, or until the cheese is melted and bubbly.

The peppers should remain slightly firm with just a hint of softness.

Remove from the oven and let cool for 1-2 minutes before serving, as the filling will be quite hot.