Heat oven to 400°F. Spray 13x9-inch pan with Crisco® Original No-Stick Cooking Spray. Unroll crescent dough; press in bottom of pan, pressing perforations to seal. Bake about 8 minutes or until light golden brown.
In medium bowl, place flour, vanilla, milk, eggs, melted butter and salt. Using electric hand mixer, beat 20 to 30 seconds or until batter is smooth.
Top baked crescent layer with pear slices. Pour batter over top. Place cheese pieces on batter; press some pieces down to cover with batter and leave other pieces uncovered.
Bake 20 to 30 minutes longer or until top is light golden brown and edges are golden brown. Sprinkle with powdered sugar. Serve with jam.