01 - Preheat oven to 425°F. Line a large baking sheet with parchment paper.
02 - In a large bowl, toss the sliced mushrooms with olive oil until evenly coated.
03 - In a small bowl, combine smoked paprika, garlic powder, onion powder, black pepper, salt, thyme, and chili flakes. Sprinkle the mixture over the mushrooms and toss until fully coated.
04 - Spread the seasoned mushrooms in a single layer on the prepared baking sheet, making sure not to overcrowd them.
05 - Roast for 20 to 25 minutes, stirring halfway through, until the mushrooms are golden, reduced in size, and the edges are slightly crisp.
06 - Serve hot as a side dish, or use as a topping for salads, sandwiches, or grain bowls.