Preheat oven to 350°F (177°C).

Line a 9-inch square baking pan with parchment paper, leaving overhang on the sides.

Crush graham crackers into fine crumbs using a food processor or rolling pin.

In a medium bowl, combine graham cracker crumbs and sugar.

Stir in melted butter until the mixture resembles coarse sand.

Press the mixture firmly into the prepared baking pan.

Bake the crust for 10 minutes and allow it to cool slightly.

In a mixing bowl, beat cream cheese until smooth.

Add egg yolks and beat until combined.

Mix in sweetened condensed milk, key lime juice, and lime zest.

Whisk by hand to ensure a smooth filling without lumps.

Pour the filling evenly over the warm crust.

Bake the Easy Key Lime Pie Bars for 18–20 minutes, until the edges are set and the center is slightly jiggly.

Remove from the oven and cool for 30 minutes.

Refrigerate for at least 2–3 hours until fully chilled.

Lift bars from the pan using the parchment overhang.

Slice into squares and garnish as desired before serving.