Bring a large pot of water to a boil. Carefully, add each egg into the water. Cook for about 7 min for a jammy egg. While eggs are cooking, make an ice bath. Transfer eggs into ice bath when they finish cooking.
When eggs are cool enough to touch, peel and add 4 to a bowl, leaving 2 aside.
Add chives, celery, yogurt (or mayo/sour cream), Franks to the bowl with the eggs. Season with salt and pepper. Using a fork, smash everything together until smooth and creamy. Season to taste.
Preheat oven to broil. Slice rolls and add blue cheese crumbles to both sides. Broil for 2-3 min or until melty and bread is golden brown. Add arugula and eggs salad. Add a jammy egg to each sandwich. Slice and that’s it! Enjoy!