Combine mustard, thyme, and rosemary in a small bowl. Spread about 1 teaspoon of the mixture over each chicken breast. Spray a baking sheet with nonstick coating. Place one phyllo sheet on work surface; spray lightly with nonstick coating. Top with two more phyllo sheets, spraying each layer with nonstick coating. Cut the stack of phyllo sheets in half lengthwise to form two 6-1/2x17 inch stacks./ Place 1 teaspoon bread crumbs along one short edge of each stack. Place one chicken breast half crosswise atop bread crumbs. Fold long sides over chicken and begin to roll up, starting from the end with the chicken. Transfer package to prepared baking sheet. Spray package with nonstick coating. Repeat with remaining phyllo and chicken. Bake in a 375 degree oven for 15 to 20 minutes or till golden brown.