I used baby bellas last night also...
2 Tb Olive Oil
1 lb beef tenderloin trimmings, cut into 1” cubes
1c thin sliced portabellas, in 1” width pieces
½ cup diced shallot
1.5 cup cleaned spinach leaves, no stems
½ cup burgundy wine
¾ cup vegetable broth
2-3 Tb heavy cream
1 Tb butter
salt and pepper
2tsp corn starch
[FONT="]Heat oil on med-high in large skillet. Season beef with salt and pepper. Sear in hot oil, browning on all sides (5-6 mins). Add mushrooms and shallots, stir, and cook 2 more minutes. Add wine and reduce 1 minute. Add spinach and stock, reduce for 4 more minutes. Add cream and butter and season with salt and pepper. Dissolve corn starch in ½ cup room temperature water. Add to everything, mix in, simmer 1.5 minutes. Serve over rice[/FONT]