French Green bean and mushroom bake

In a saucepan melt:
2 T. butter

ADD:
2 c. mushrooms,
Saute until reduced slightly and tender

Puree in blender:
Mushrooms+1/2 c. whole milk

Return to saucepan,
Add:
2 c. whole milk
1/3 c. cornstarch
¼ t. black pepper
1 t. salt
Cook over medium heat until thickened.

Add:
16 oz. French cut green beans
1 c. fresh or frozen green peas

Pour into casserole dish,
Sprinkle over the top:1 c. crushed corn chips
Then cover casserole with foil or parchmentAnd Bake at 450 for 25 minutes.