Preheat oven to 450 F.
Cook bacon in a large pan over med-high heat, about 2-3 min. Add diced halloumi cheese and fry for 1-2 min. Meanwhile, wash and slice brussels sprouts in half.
In a large bowl, toss brussels sprouts in olive oil, salt and pepper. Toss with bacon and halloumi cheese.
Spread mixture among a parchment-lined baking sheet, then bake in the oven for 12 min, tossing halfway through.
Remove from oven, serve immediately and enjoy!