Sunny's Easy Smothered Chicken

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3 tablespoons olive oil, plus more if needed

Two 8-ounce containers sliced white button mushrooms 

1 sprig fresh thyme 

1 medium sweet or white onion, large diced 

Kosher salt and freshly ground black pepper 

2 tablespoons all-purpose flour 

1 tablespoon Dijon mustard 

2 cups beef stock, warmed 

4 grilled chicken breasts, from the freezer or refrigerator section of the grocery, thawed if frozen

Two 10-ounce containers microwavable white rice

3 tablespoons chopped fresh parsley