Preheat oven to 375°F. Spray 13x9-inch baking dish with cooking spray; set aside. Heat oil in large skillet over medium-high heat. Add mushrooms; cook and stir about 8 minutes or until liquid is released and evaporates. Add leeks and garlic; cook and stir 3 minutes or until leeks are tender. Stir in peppers. Remove from heat.
Layer half of the potatoes into bottom of prepared dish and sprinkle with 1 cup of the cheese. Top with half of the vegetable mixture. Layer remaining potatoes over vegetables; top with remaining vegetables. Whisk together eggs, milk, salt, thyme and pepper in medium bowl. Pour evenly over ingredients in dish. Cover with aluminum foil.
Bake 1 hour or until potatoes are tender. Remove foil, top with the remaining cheese. Bake 10 minutes or until cheese melts and is lightly browned. Let stand 10 minutes. Cut into 10 peices to serve.
Adapted - Ready Set EAT
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