My neighbor still makes these every April using leftover Easter corned beef

These oven baked 3-ingredient corned beef crescent triangles are exactly the kind of thing my neighbor sets out every April, once the Easter corned beef has had its big moment at the table. Instead of letting those rosy slices linger in the fridge, she tucks them into store‑bought crescent dough and bakes them into flaky little hand pies. This is a very practical, Midwestern, weeknight kind of recipe: three ingredients, no special equipment, and the payoff is a platter of golden triangles that feel a bit like a deli sandwich crossed with a buttery pastry. They’re perfect for using up leftover corned beef without feeling like you’re eating the same meal twice.

Serve these warm triangles on a cream or neutral-colored platter so the golden crust and pink corned beef stand out. They pair well with a simple green salad dressed with a tangy vinaigrette, a bowl of pickles, or crunchy coleslaw to cut through the richness. Set out small bowls of mustard, Russian or Thousand Island dressing, or horseradish sauce for dipping. They make an easy lunch with a cup of tomato soup, or a casual appetizer alongside cold beer, hard cider, or a light red wine.

Servings: 8 triangles (about 4–6 servings as a snack or appetizer)

1 (8-ounce) tube refrigerated crescent roll dough

Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or lightly grease it so the triangles release easily after baking.

Unroll the crescent roll dough onto a clean work surface. Gently press along the perforations to seal them, creating one solid sheet of dough. If the dough feels very soft or sticky, you can chill it in the refrigerator for 5–10 minutes to make it easier to handle.

Using a sharp knife or pizza cutter, cut the dough sheet into 8 roughly equal squares or rectangles. Don’t worry about perfect geometry; the important thing is that you can fold each piece over to form a triangle.

In a small bowl, combine the finely chopped leftover corned beef and shredded Swiss cheese, tossing them together so the cheese is evenly distributed. This ensures each bite has a balance of salty meat and melty cheese.

Spoon a generous tablespoon of the corned beef and cheese mixture onto one half of each dough piece, leaving a small border around the edges so you can seal them. Avoid overfilling; too much filling can cause the triangles to burst open in the oven.

Fold the bare half of each dough piece over the filling to form a triangle. Press the edges firmly together with your fingers, then crimp all around with the tines of a fork to help keep the filling inside and give a neat, rustic edge.

Transfer the filled triangles to the prepared baking sheet, spacing them an inch or two apart to allow for puffing in the oven. If any seams have opened, pinch them closed again before baking.

Bake on the center rack for 12–15 minutes, or until the triangles are puffed and deep golden brown on top and along the edges. Ovens vary, so begin checking at the 12-minute mark; the bottoms should also be lightly browned and crisp.

Remove the baking sheet from the oven and let the triangles rest for 5 minutes. This short cooling time helps the cheese set slightly so it doesn’t ooze out when you bite in, and it keeps the interior from being too hot to handle.

Arrange the warm triangles on a cream-colored or light platter so the flaky, golden crust and pink corned beef filling are visible. Serve warm, with your choice of dipping sauces on the side if you like.

You can play with this basic three-ingredient framework while keeping the spirit of an easy, post-holiday recipe. If you don’t have Swiss cheese, try shredded cheddar, provolone, or a mild Gouda—each will melt nicely and complement the salty corned beef. For a subtle kick, mix a teaspoon or two of grainy mustard or prepared horseradish into the corned beef and cheese before filling the dough (this technically adds a fourth ingredient, but the method stays the same). If your leftover corned beef is very lean, you can moisten it with a teaspoon of the cooking liquid or a dab of mayonnaise so the filling doesn’t feel dry once baked. To stretch the recipe for a crowd, cut each crescent dough sheet into smaller pieces and make bite-sized triangles, reducing the baking time slightly and watching closely. For a Reuben-inspired twist, tuck a pinch of well-drained sauerkraut into each triangle with the filling—just be sure to squeeze out as much liquid as possible so the dough doesn’t get soggy. Food safety notes: Cool leftover corned beef promptly after the original meal and refrigerate it within 2 hours; use it within 3–4 days for best quality and safety. Keep the corned beef chilled until you’re ready to assemble the triangles, and avoid letting it sit at room temperature for extended periods. Always wash your hands, cutting board, and knife after handling the meat and before working with the dough. Bake the triangles until the dough is fully cooked and browned, and refrigerate any leftovers within 2 hours; reheat them in a 350°F (175°C) oven until hot throughout before serving again.