If you love the cozy comfort of a casserole but want something faster (and way more flavorful), this Beef and Onion Skillet Gratin with Potatoes is your dinner. It’s savory, cheesy, and layered with tender potatoes, caramelized onions, and seasoned beef—all made right in one skillet.
Why you’ll love this skillet gratin
- One-pan comfort food: Cook, layer, and bake in the same oven-safe skillet.
- Big flavor, simple steps: Sweet onions, savory beef, and a creamy, cheesy finish.
- Perfect for busy nights: No fussy techniques, just solid, dependable results.
- Great leftovers: Reheats beautifully for lunch the next day.
Ingredients you’ll need
- Yukon Gold potatoes: Creamy texture and they hold their shape (Russets work too, just softer).
- Yellow onions: Cooked until golden for that classic sweet-savory base.
- Ground beef: 80/20 gives the best flavor; drain excess fat as needed.
- Garlic: Adds depth without overpowering.
- Beef broth: Keeps everything moist and boosts savoriness.
- Heavy cream: For a gratin-style richness (half-and-half is fine in a pinch).
- Cheese: Sharp cheddar + Gruyère (or Swiss) for melt + flavor.
- Seasonings: Kosher salt, black pepper, smoked paprika, thyme (dried or fresh), and a little Dijon mustard (optional but excellent).
- Butter + olive oil: For onions and browning.
How to make Beef and Onion Skillet Gratin with Potatoes
1) Prep the potatoes. Slice potatoes into thin rounds (about 1/8-inch). The more even the slices, the more evenly they cook. If you have a mandoline, this is the moment.
2) Caramelize the onions. In a large oven-safe skillet (10–12 inches), warm olive oil and butter over medium heat. Add sliced onions with a pinch of salt and cook, stirring often, until deeply golden and soft, about 12–18 minutes. Stir in garlic for 30 seconds.
3) Brown the beef. Add ground beef to the skillet, breaking it up and browning until no longer pink. Season with salt, pepper, smoked paprika, and thyme. Drain excess grease if needed.
4) Build the sauce. Stir in beef broth, cream, and Dijon (if using). Scrape up any browned bits from the bottom—those are pure flavor.
5) Layer and top. Nestle the potato slices into the beef mixture, fanning them slightly so they’re mostly submerged. Sprinkle evenly with the cheeses.
6) Bake until bubbly. Transfer the skillet to a 375°F oven and bake until the potatoes are tender and the top is browned and bubbling, about 35–45 minutes. If you want more color, broil for 1–2 minutes at the end (watch closely).
7) Rest, then serve. Let it sit for 10 minutes so it sets up. Spoon into bowls or slice into wedges like a skillet pie.
Tips for the best results
- Slice potatoes thin: Thick slices can stay firm in the center.
- Keep potatoes mostly covered: The cream/broth mixture helps them cook through. Add a splash more broth if needed.
- Use a flavorful cheese combo: Cheddar for punch + Gruyère/Swiss for that classic gratin melt.
- Don’t rush the onions: They’re the backbone of the dish—golden onions make everything taste richer.
Easy variations
- Add mushrooms: Sauté sliced mushrooms after the onions, then continue.
- Swap the protein: Ground turkey works; add a touch more seasoning and a little extra butter for richness.
- Make it spicy: Add crushed red pepper or diced jalapeño, and use pepper jack on top.
- More veggies: Stir in baby spinach at the end of browning the beef, just until wilted.
What to serve with it
- Simple green salad: Something crisp with a tangy vinaigrette balances the richness.
- Roasted broccoli or green beans: Easy sheet-pan sides.
- Crusty bread: Optional, but great for scooping up the creamy sauce.
Storage and reheating
Refrigerate: Store cooled leftovers in an airtight container for up to 4 days.
Reheat: Warm in the microwave in 60–90 second bursts, or reheat in a 350°F oven (covered) until hot. Add a splash of broth or cream if it looks dry.
Freeze: You can freeze it, but the potatoes may soften a bit after thawing. Freeze in portions for up to 2 months, then thaw overnight before reheating.
Beef and Onion Skillet Gratin with Potatoes (Recipe)
Yield: 4–6 servings
Time: 20 minutes prep, 45 minutes cook
Ingredients
- 1 1/2 lb Yukon Gold potatoes, thinly sliced (about 1/8-inch)
- 2 tbsp olive oil
- 1 tbsp unsalted butter
- 2 large yellow onions, thinly sliced
- 3 cloves garlic, minced
- 1 lb ground beef (80/20 recommended)
- 1 tsp kosher salt, plus more to taste
- 1/2 tsp black pepper
- 1 tsp smoked paprika
- 1 tsp dried thyme (or 1 tbsp fresh thyme leaves)
- 3/4 cup beef broth, plus more as needed
- 3/4 cup heavy cream (or half-and-half)
- 1 tsp Dijon mustard (optional)
- 1 cup shredded sharp cheddar
- 1 cup shredded Gruyère or Swiss
Instructions
- Preheat oven to 375°F.
- In a 10–12 inch oven-safe skillet over medium heat, warm olive oil and butter. Add onions and a pinch of salt. Cook 12–18 minutes, stirring often, until golden and very soft.
- Add garlic and cook 30 seconds.
- Add ground beef. Cook until browned, breaking it up as it cooks. Season with salt, pepper, smoked paprika, and thyme. Drain excess fat if needed.
- Stir in beef broth, cream, and Dijon (if using), scraping the bottom of the skillet to release browned bits.
- Arrange potato slices into the skillet, fanning slightly and pressing down so most slices are covered by liquid. Add a splash more broth if the skillet looks dry.
- Top with cheddar and Gruyère.
- Bake 35–45 minutes, until potatoes are fork-tender and cheese is browned and bubbling. Broil 1–2 minutes if you want extra color.
- Rest 10 minutes before serving.
