In a small bowl combine dry mustard, adobo seasoning, cornstarch, salt and pepper, mix well. Add beef and stir to coat well. Veggie spray a frypan ; dump meat mixture into frypan making sure to get all of the seasoning/thickening mix into the frypan.
Brown on all sides; about 10 minutes.
Add beef broth to frypan, stir to mix and deglaze pan; bring to a heavy simmer, decrease heat to slow simmer. Simmer for one hour.
Serve over mashed potato with veggies on the side.