(whisking constantly) reduce heat and whisk continuously until mixture thickens. About 1 minute. Remove from heat and serve as a gravy or transfer meat to a serving platter
This Slow Cooker Beef Roast With Portabella Mushrooms relies on simple, everyday ingredients such as beef roast, garlic cloves, small onion, finely chopped and pepper. It comes together quickly and makes 4 servings, at about 286 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.
It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.
Updated Jun 30, 2026