Cook tortellini and broccoli as directed on tortellini package. Drain; return tortellini and broccoli to saucepan.
Meanwhile, puree 1/3 cup roasted peppers in blender. Add Alfredo sauce; blend until mixed.
Add Alfredo sauce mixture, chicken and 2 tablespoons roasted peppers to tortellini and broccoli in saucepan; mix well. Cook and stir over medium heat for 2 to 3 minutes or until thoroughly heated, stirring occasionally. Spoon into ungreased shallow 1 to 1 1/2-quart casserole. In small bowl, combine butter and bread crumbs; mix well. Sprinkle over top.
Broil 4 to 6 inches from heat for 1 to 2 minutes or until topping is golden brown.