FOR THE CRUST:
4 tablespoons butter, melted and cooled, plus more for pan
1-1/2 cup graham cracker crumbs
1/4 cup sugar
FOR THE FILLING:
2 large egg yolks
1 can (14 ounces) sweetened condensed milk
1/2 cup fresh lemon juice (3 lemons)
Preheat oven to 350F / 180C degrees.
Brush a square baking dish with melted butter.
Crush graham crackers
Then add in sugar and butter and blend to mix.
Press mixture into bottom of prepared pan.
Bake until lightly browned, 8 to 12 minutes.
Cool crust, 30 minutes.
TO MAKE THE FILLING
In a large bowl, whisk together egg yolks and condensed milk.
Add lemon juice; whisk until smooth.
Pour filling into cooled crust; carefully spread to edges.
Bake until set, about 15 minutes.
Cool in pan on rack.
Chill at least 1 hour before serving.
Serve with whipped cream.