Preheat oven to 375 degrees F. In 1-QT bowl, combine mayo and mustard. Snip parsley with kitchen shears. Chop onion with food chopper. Add parsley and onion to mayo mixture; mix well. In classic 2-QT batter bowl, flake chicken with pastry blender. Chop bacon with food chopper. Add bacon, 3/4 cup of the cheese, and 1/3 cup of the mayo mixture; mix well.
Unroll crescent dough; separate into 16 triangles. Arrange triangles in a circle on 13 inch round baking stone or pizza pan with wide ends of triangles overlapping in the center and points toward the outside. (there should be a 5 inch diameter opening in center of stone.) Using medium stainless steel scoop, scoop chicken mixture evenly onto widest ends of each triangle. Bring outside points of triangles up over filling and tuck under wide ends of dough at center of ring.(filling will not be completely covered.) Slice tomatoes and cut slices in half. Place 1 tomato half over filling between openings of ring. Bake 20-25 minutes or until deep golden brown. Remove from oven; immediately sprinkle with remaining 1/4 cup cheese. Cut bell pepper into halves and remove membranes and seeds. Fill with remaining mayo mixture; place in center of ring. Arrange lettuce around bell pepper. Slice and enjoy.