Layer onion, carrots, celery and garlic in a large slow cooker.
Scatter mushrooms over top of veggies in crock pot.
Rub one teaspoon olive oil all over the roast.
Season roast with salt and pepper.
Place roast on top of mushrooms and other veggies.
Tuck sprigs of thyme and bay leaf around roast.
In a small bowl, combine beef broth and tomato paste.
Pour mixture over top of roast.
Cover slow cooker; cook on high setting for about 4-6 hours.
Remove roast from slow cooker and keep warm.
Pour liquid with vegetable mixture from the slow cooker into a medium-sized saucepan.
Remove and discard thyme sprigs and bay leaf.
Bring mixture to a boil.
Combine two tablespoons olive oil and flour in a small bowl.
Whisk until well blended.
Stir flour mixture slowly into liquid in saucepan.
Boil, stirring constantly until mixture thickens – about one minute.
Meanwhile, cook noodles according to package directions.
Drain noodles well in colander and toss with additional olive oil so the noodles don’t stick.
Slice roast.
Serve with veggies, gravy and cooked egg noodles.