Melt butter in a saucepan over medium heat until it foams and turns golden brown. Stir often so the milk solids toast evenly without burning. Once it smells nutty and turns amber, remove from heat and set aside to cool.
Mix crumbs, ground pecans, powdered sugar, and browned butter until the mixture resembles wet sand. Press firmly into the pan bottom and slightly up the sides. Bake briefly to set the crust before reducing oven temperature.
Beat softened cream cheese with brown sugar, salt, and vanilla bean seeds until smooth. Mix in sour cream and brown butter bits, then gently blend in eggs one at a time. Avoid overmixing to keep the texture creamy.
Place the pan in a larger dish filled with warm water and bake slowly. The cheesecake should be set but slightly jiggly in the center. Turn off the oven and allow it to cool inside gradually before refrigerating.
Whip heavy cream with brown sugar, salt, and vanilla until soft peaks form. Spread or pipe over chilled cheesecake just before serving for a light, fluffy finish.