Created by lillyindy on December 3, 2016
Step 1: Preheat oven to 375° Grease an 8-inch baking dish.
Step 2: Place the potatoes in on a large microwave-safe plate. Microwave on HIGH until fork tender.
Step 3: In another saucepan, heat butter over medium-high heat. Add mushrooms and onion; cook and stir 6-8 minutes or until tender. Stir in garlic; cook 1-2 minutes longer.
Step 4: In a small bowl, whisk flour, broth and seasonings until smooth; stir into mushroom mixture. Bring to a boil, stirring constantly; cook and stir 1-2 minutes or until sauce is thickened. Remove from heat; stir in sour cream.
Step 5: Arrange half of the potatoes in the baking dish. Top with chopped spinach.
Step 6: Spread half of the hot mushroom sauce over top; sprinkle with 1 cup cheese. Layer with remaining potatoes, sauce and cheese.
Step 7: Bake, uncovered 20 minutes or until heated through and cheese is melted. Let stand 10 minutes before serving.