Preheat pan: In a large baking tray or sheet pan, add 3 tablespoon of olive oil and pop into the oven until hot.
Prepare brussels sprouts: While the oil is heating, clean the Brussels sprouts under cold running water and pat very dry with absorbent paper. Using a sharp knife, remove the slice off the bottom part of the core, remove the outer leaves and cut the brussels sprouts in half.
Dress brussels sprouts: In a large bowl, combine the Brussel sprouts, 2 tablespoon of olive oil, parmesan and a generous amount of salt and pepper. Mix well with your hands until all ingredients are well combined and the Brussels sprouts are well coated.
Bake: Remove the tray with the hot oil from the oven and very carefully pour the Brussels sprouts onto the tray. You will hear a delightful sizzle sound. Using tongs, turn the Brussels sprouts over so they are cut side down. Cook for 25 – 30 minutes, flipping over halfway, or until they are crispy and brown on the outside.
Cook bacon: While the Brussels sprouts cook, add slices of bacon to a large cold pan. Turn the heat to high and cook the bacon for 3 minutes on each side or until your desired crispiness. Remove the bacon from the pan and place onto absorbent paper. When slightly cooled, cut the bacon into small bacon bits.
Finish & serve: Place the cooked brussel sprouts into a large bowl and drizzle over the balsamic glaze. Add the sliced bacon to the bowl and mix well. Serve immediately with some crumbled feta and a little extra grated parmesan over the top.