Step 1

In a large skillet over medium heat, cook the olive oil, pepper, and red pepper flakes together until toasted, 30 seconds to 1 minute.

Step 2

Add the Brussels sprouts and cook, without stirring, until they begin to soften, about 2 minutes.

Step 3

Season with the salt, and cook until the Brussels sprouts just begin to char, about 2 minutes.

Step 4

Remove the skillet from the heat and add the Parmesan, lemon zest, and hazelnuts.

Step 5

Serve warm, topped with more fresh Parmesan, if desired.