Pour about 3 tablespoons olive oil into the bottom of a large Dutch oven.
Heat oil over medium heat.
Add beef and brown.
Add 1-2 cups water, cover with lid and simmer for 45 minutes to an hour or until beef is tender.
You may have to add more water.
Remove beef and liquid from Dutch oven and set aside.
Add remaining oil to skillet or Dutch oven.
Add onion, bell pepper and celery and sauté a few minutes until vegetables are soft.
Add 4 cups hot water and the beef broth mixture back into the Dutch oven.
Add Worcestershire sauce, bouillon base, salt, pepper, thyme and mixed vegetables.
Simmer over medium heat for about an hour until beef and veggies are tender.
Add additional water, if necessary.
Whisk flour and cold water together and add as much of the thickening mixture as necessary to achieve the desired thickness.
Pour beef mixture into a greased 9x13” glass baking dish.
While beef is cooking, prepare biscuits.
Preheat oven to 425°.
Place biscuits on top of the beef mixture.
Bake about 20-25 minutes until biscuits are baked and lightly golden on top.
Brush biscuits with melted butter.