Preheat oven to 400ºF.

Coarsely crush FUNYUNS^® Onion Flavored Rings (makes about 1 ¼ cups).

In medium saucepan of boiling salted water set over medium heat, cook green beans, stirring occasionally, 3 to 4 minutes or until tender. Drain and rinse with cold water to stop the cooking process. Drain well.

In large skillet set over medium-high heat, melt butter. Add mushrooms, salt and pepper; cook, stirring occasionally, for 5 to 7 minutes or until mushrooms are starting to brown. Stir in onion and garlic; cook, stirring occasionally, for 3 to 5 minutes or until onions are starting to soften.

In large bowl, toss together green beans, mushroom mixture, condensed mushroom soup, sour cream and Parmesan. Transfer to greased 13 x 9-inch baking dish; smooth top. Sprinkle with crushed FUNYUNS^®.

Bake for 25 to 30 minutes or until golden brown and bubbling.

Garnish with scallions before serving.