Preheat your oven to 350°F (175°C).

Place your unbaked pie crust in a 9-inch pie dish and crimp the edges for a decorative finish.

In a large mixing bowl, whisk together the sweetened condensed milk, eggs, brown sugar, melted butter, and vanilla extract until fully combined and smooth.

Gently fold in the pecan halves, ensuring they are well-coated with the filling mixture.

Pour the pecan filling into the prepared crust, spreading it evenly.

Bake in the preheated oven for 40-50 minutes, or until the filling is set in the center and slightly puffed around the edges.

Once baked, let the pie cool on a wire rack for at least an hour.

Serve warm or at room temperature, optionally with whipped cream or vanilla ice cream.