Roast Beef with Mushroom Sauce

My cooking day was filled with cooking a roast at 300 degrees, then made salmon patties. Later I made a three bean salad.

Working all week and limited hours to cook leads me to cook once a week for weekly meals and our lunch menus. I also buy a couple premade meals from Trader Joe's. And yes, I do read the ingredients.

Since I had roast beef slices and quite a few cremini mushrooms I made a sauce to pour over rice.

Roast Beef with Mushroom Sauce

In large open pan add 1 1/2 Tablespoons olive oil. Heat just a bit and add 1/4 diced red onions (or what ever onion you have).

Sautee for a few minutes than add 5-6  washed and sliced cremini mushrooms. Saute for 5 minutes until they soften.

Add juice from roast. Heat until almost bubbly. Add 1/4 C half and half or what ever dairy you have.

Stir and cook on low heat for 3 minutes.

In a small bowl add 2 Tablespoons half and half and 1 Tablespoon corn starch or flour. Whisk to get all the lumps out. Add to mixture.
Once it thickens add slices of roast beef on top and cover.
Serve over rice.