Patty Melts with Secret Sauce

May be an image of rye bread

Patty Melts with Secret Sauce

A Diner-Style Classic Made Better at Home

Few comfort foods can compete with a perfectly made patty melt. It’s not quite a burger and not quite a grilled cheese—it’s the best of both worlds. Juicy beef patties, sweet caramelized onions, melted cheese, and crisp, buttery bread all come together in one irresistible sandwich. What truly sets this version apart is the secret sauce, a creamy, tangy spread that takes the classic patty melt to the next level.

Below is a complete, step-by-step guide to making Patty Melts with Secret Sauce at home, with tips to ensure restaurant-quality results every time.

Ingredients You’ll Need

For the Patty Melts

Ground beef (80/20 works best for juiciness)
Salt and black pepper
Yellow or white onions, thinly sliced
Rye bread or sandwich bread of your choice
Swiss cheese slices
Cheddar cheese slices
Butter, softened

For the Secret Sauce

Mayonnaise
Ketchup
Yellow mustard
Sweet pickle relish
Garlic powder
Paprika

Step-by-Step Method

Step 1: Prepare the Secret Sauce

Start by making the sauce so the flavors have time to blend.
In a small bowl, combine mayonnaise, ketchup, mustard, sweet pickle relish, a pinch of garlic powder, and a light sprinkle of paprika. Mix until smooth and creamy.

Cover and refrigerate while you prepare the rest of the ingredients. This resting time helps the sauce develop its signature tangy flavor.

Step 2: Caramelize the Onions

Heat a skillet over medium heat and add a small amount of butter.
Add the sliced onions and cook slowly, stirring occasionally. The key here is patience—allow the onions to soften and gradually turn golden brown.

This process usually takes 15–20 minutes. Once caramelized, remove the onions from the pan and set them aside.