Preheat oven to 425 degrees F and lightly brush a large baking sheet with olive oil.
Bring a large saucepan of salted water to a boil. Add brussels sprouts and cook for 8-10 minutes, until they're fork-tender but not mushy. Drain well and let sprouts dry for a few minutes on a clean towel or paper towel-lined sheet pan. Excess moisture will keep them from crisping up.
Place brussels sprouts on prepared baking sheet with about 1" between them. Use the bottom of a glass or a measuring cup to gently smash each one to about ½" thickness.
Brush sprouts with olive oil and sprinkle with paprika, garlic powder, salt, and pepper.
Bake for 20-25 minutes, flipping halfway through baking time, until sprouts are brown and crispy.
Remove from oven and immediately drizzle the hot sprouts with hot honey and lemon juice. Sprinkle with toasted panko and parsley if using. Taste and season with additional salt if needed.
Serve right away as these are best enjoyed right out of the oven.