French Dip Squares are a deliciously unique spin on the classic French dip sandwich, perfect for any occasion from casual get-togethers to cozy weeknight dinners. These savory squares feature layers of tender roast beef, gooey melted cheese, and zesty Dijon mustard, all wrapped in flaky puff pastry. When baked, they transform into golden-brown squares that pair beautifully with rich au jus for dipping. Not only are they easy to make, but they’re also highly customizable—add sautéed onions or your favorite spices to enhance the flavor even more. In just about an hour, you can whip up this crowd-pleaser that will leave everyone asking for seconds.