This twist on a standard green bean casserole is elevated to creamy, delicious heights, thanks to thick low-fat Greek yogurt.
Bring a large pot of water to a boil. Blanch beans until tender, about 6 minutes. Drain.
Meanwhile, heat 1 1/2 teaspoons oil ina large nonstick skillet over medium heat.Cook shallots, stirring occasionally, untiltender and just starting to brown, 3 to4 minutes. Transfer shallots to a small bowl,and wipe skillet clean with a paper towel.
Whisk together stock and cornstarch. Heat remaining tablespoon oil in skillet over high heat. Cook mushrooms, stirring occasionally, until golden brown, about 6 minutes. Reduce heat to low; add shallots. Whisk in stock mixture. Cook until thick, about 3 minutes more. Remove from heat. Stir in yogurt and 1/2 teaspoon salt; season with pepper. Toss in beans. Serve warm.