Preheat oven to 450º Slice brussels sprouts into halves or quarters depending on how large they are. Drizzle them in oil, salt and pepper, red pepper flakes, mix well.
Spread the brussel sprouts on the cooking sheet in an even layer. Place in the oven for 15 -20minutes. Be sure to toss once or twice throughout the baking process. Make sure to check the sprouts, oven temps vary greatly.
While the brussel sprouts are baking, add the butter and garlic to a large skillet. Melt the butter in the skillet on medium heat. Turn the heat to low.
On the lowest heat, add sriracha, honey and mix well for 1 minute. Turn off the heat off, add the peanut butter and mix in well.
Pull the brussel sprouts from the oven, pour the honey sriracha sauce over them, mix well to ensure everything is coated well. Pop back into the oven for about 4-6 minutes and then serve and enjoy!