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1
Preheat oven to 350 degrees F (175 degrees C).
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2
Spray a baking sheet with cooking spray.
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3
Chop green onions and mushrooms very finely, to a nearly paste-like consistency.
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4
Melt butter in a small saucepan over medium heat; stir in green onions and mushrooms and cook and stir until fragrant, about 2 minutes.
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5
Whisk cornstarch into half-and-half; pour into mushroom mixture and cook, stirring often, until thickened, about 3 minutes.
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6
Season mushroom mixture with salt, pepper, and garlic powder.
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7
Roll bread slices with a rolling pin until very flat and thin.
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8
Spread mushroom mixture evenly onto flattened bread; tightly roll up bread slices.
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9
Slice each bread tube into 1-inch thick rounds; place rounds onto a baking sheet.
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10
Bake in the preheated oven until bread is browned, about 10 minutes.
