Preheat the oven to 350°F. Coat a 2 quart casserole dish with cooking spray.
Heat the olive oil in a large nonstick skillet over medium-high heat. Add mushrooms and sauté 5 minutes, or until tender. Combine mushrooms and remaining ingredients, stirring until well-blended.
Spoon the mixture into prepared dish. Bake for 30 minutes or until thoroughly heated (bubbly).