Preheat oven to 425℉.
Place Brussel sprouts on a baking sheet and drizzle with olive oil, and sprinkle with salt and pepper. Toss until combined.
Roast in the oven for 20 minutes, tossing halfway through. If brussels are extra large, they may require a few more minutes.
A few minutes before the halfway mark of roasting, prepare your glaze by adding apple cider, apple cider vinegar and maple syrup to a saucepan over medium heat.
Let mixture reduce by about two-thirds, stirring occasionally. This should take about 10-15 minutes. At 10 minutes, watch the mixture closely.
The glaze is ready when the consistency and color is similar to maple syrup (sticky, mahogany and thick enough to leave a film on the back of a spoon).
Remove glaze from heat, immediately add garlic and salt, and stir.
Let cool for about 5 minutes. The glaze will become thicker as it cools.
Finish and Serve:
