Philly Cheesesteak Quesadilla with Garlic Aioli
The Philly Cheesesteak Quesadilla is already one of the best things on the site. This version takes the same concept — thinly sliced sirloin, sautéed peppers and onions, provolone and American cheese — and adds two things: a Worcestershire deglaze on the filling and a garlic aioli dipping sauce that changes the whole experience. If the original is the weeknight reliable, this is the version you make when you actually want to impress someone with a quesadilla.
The garlic aioli is the headline. Mayo, Dijon, fresh garlic, a pinch of salt — two minutes of stirring. Served alongside for dipping, it does what Cheez Whiz does for a real Philly cheesesteak: gives you something rich, tangy, and garlicky to drag each wedge through. It makes the quesadilla feel significantly more elevated than a standard cheese quesadilla, which is the goal.
The Thin Slice
Partially freeze the sirloin for 15 minutes before slicing. A slightly firm steak slices paper-thin with a sharp knife — this is the technique that produces Philly cheesesteak-style beef at home without a commercial meat slicer. The thinner the slice, the faster it cooks and the better it integrates with the peppers and onions in the filling. A 60-second sear at high heat on thin slices produces beef that’s just cooked through with some color on the outside. Thick slices at the same temperature will be raw inside or overdone outside.
Slice against the grain regardless of thickness. Cutting against the grain shortens the muscle fibers and makes every bite noticeably more tender.
The Worcestershire Deglaze
After the peppers and onions are cooked and the garlic has gone fragrant, add a splash of Worcestershire sauce and stir — it hits the hot pan and immediately picks up all the browned bits from the bottom, adding a savory, deeply umami note to the vegetable filling. This is a 5-second step that changes the flavor of the filling meaningfully. The same Worcestershire note runs through the garlic aioli via the Dijon, creating a flavor connection between the filling and the dipping sauce.
The Cheese Combination
American cheese melts at a lower temperature than provolone and acts as the structural glue that holds the filling in place when you cut and pull wedges. Provolone provides the flavor. Using both — American for melt and binding, provolone for flavor — is the same approach as a real Philly cheesesteak. American cheese alone is flat. Provolone alone tends to stay in strings and the quesadilla doesn’t hold together as cleanly.
What to Serve With It
The garlic aioli is the dipping sauce — it’s already accounted for. A simple green salad alongside. If you want to go deeper into the steak quesadilla category, the Steak and Caramelized Onion Quesadilla covers a sweeter, richer version. For other steak recipes to link into the rotation, the Cowboy Butter Steak Bites and Air Fryer Steak and Potatoes use the same cut in different formats.
Philly Cheesesteak Quesadilla with Garlic Aioli
Ingredients
Meat & Protein
- ½ lb sirloin steak sliced as thin as possible against the grain — partially freeze 15 minutes for easier slicing
Produce
- ½ green bell pepper thinly sliced
- ½ yellow onion thinly sliced
- 3 garlic cloves minced — 2 for the filling, 1 for the aioli
Dairy
- ¾ cup provolone cheese freshly shredded
- 2 American cheese slices
- 2 tbsp unsalted butter for toasting tortillas
Pantry & Canned Goods
- 2 flour tortillas large, burrito size
- 3 tbsp mayonnaise Hellmanns or Dukes recommended — for garlic aioli
- 1 tsp Dijon mustard for garlic aioli
- 1 tsp Worcestershire sauce
- 1 tbsp olive oil
Seasonings & Spices
- ½ tsp kosher salt divided
- ½ tsp black pepper divided
- ½ tsp smoked paprika
Instructions
- Make the garlic aioli: stir together the mayonnaise, Dijon mustard, 1 minced garlic clove, and a pinch of salt and pepper in a small bowl. Refrigerate until serving.
- Heat the olive oil in a large skillet over medium-high heat. Add the sliced onion and green pepper with a pinch of salt. Cook for 4 to 5 minutes, stirring occasionally, until softened and beginning to char at the edges. Add 2 minced garlic cloves and cook for 30 seconds. Add the Worcestershire sauce and stir to coat. Remove vegetables to a plate.
- Increase heat to high. Season the thinly sliced steak with ¼ tsp salt, ¼ tsp black pepper, and smoked paprika. Add to the hot skillet in a thin layer — work in batches if needed. Cook for 60 seconds without moving, then stir and cook for another 30 seconds until just cooked through. Return the vegetables to the pan and toss everything together briefly. Remove from heat.
- Lay both tortillas flat. Tear the American cheese slices and distribute half over one tortilla. Scatter the shredded provolone over the American cheese. Layer the steak and pepper-onion mixture evenly over the cheese. Top with the remaining American cheese and provolone. Place the second tortilla on top.
- Melt 1 tbsp butter in the skillet over medium heat. Add the assembled quesadilla. Cook for 3 to 4 minutes until the bottom is golden. Flip carefully. Add the remaining 1 tbsp butter and cook for another 2 to 3 minutes until the second side is golden and the cheese is fully melted.
- Transfer to a cutting board and rest for 1 minute. Cut into wedges. Serve immediately with the garlic aioli alongside for dipping.
