Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper or aluminum foil and set aside.
Fill a large pot with water. Add 2 tsp of salt and bring to a boil.
Trim the stems from the Brussels sprouts and remove and yellow or brown outer leaves.
Fill a large bowl with ice water and set aside.
When the water is boiling, add the Brussels sprouts and cook for 3-4 minutes (this is blanching).
Drain the Brussels sprouts well and place them in the bowl of ice water to immediately stop the cooking process. Let them cool off for 1 minute.
Drain the Brussels sprouts and dry them off with a clean kitchen towel or paper towels to remove any excess moisture. Slice them in half.
Toss the halved Brussels sprouts with olive oil and 1 tsp salt.
Spread them in a single layer on the baking tray and bake for 20-25 minutes, or until golden brown and crispy.
While the Brussels sprouts are baking, prepare the glaze: Add the melted butter, honey, and maple syrup to a large bowl and whisk to combine. Add 1 tsp salt, the chili powder, smoked paprika, garlic powder, red pepper flakes, and black pepper to the bowl and whisk to combine.
When the Brussels sprouts are done, add them to the bowl with the glaze and toss to evenly coat. Serve warm.