Nonstick vegetable oil spray
2 (8-ounce) packages refrigerated crescent-roll dough
8 thin slices prosciutto
2 tablespoons honey
2 tablespoons country-style or grainy Dijon mustard
Preheat oven to 375 degrees F. Spray heavy large baking sheet with nonstick spray. Open 1 package of rolls. Unroll crescent dough and separate into 4 rectangles ( do not separate dough into triangles; press perforations together). Top each dough rectangle with 1 slice prosciutto. Starting at 1 long side, roll up dough rectangles jellyroll style. Cut each crosswise in half. Transfer to prepared baking sheet, seam side down. Repeat with second package of crescent rolls. (Can be made 1 day ahead. Cover and refrigerate.)
Whisk honey and mustard in small bowl to blend. Brush tops of rolls with honey mixture. Bake until golden brown, about 12 minutes. Cool slightly.