Chicken in Mushroom Sauce

Ingredients

• 1 shallot, minced
• 1 clove garlic, minced
• 1 tsp. + 2 tsp. + 1 Tbs. extra-virgin olive oil
• 4 pieces thin-sliced boneless, skinless chicken breast
• 6 oz. small mushrooms (any kind), quartered
• ½ cup dry or medium marsala wine (see headnote)
• 1 Tbs. flour
• 1 cup chicken stock (preferably homemade), more if needed
• ½ tsp. kosher salt
• freshly ground black pepper