Fabulous Cheesy Asparagus Tart

FABULOUS CHEESY ASPARAGUS TART4 T. butter2 large leeks, halved lengthwise and thinly slicedKosher salt/black pepper to taste1 (14-oz.0 pkg. refrigerated pie dough (2 crusts)2 c. grated fontina cheese, or favorite cheese1 c. ricotta cheese1 T. fresh thyme, chopped1 lb. fresh…