Preheat oven to 340 degrees F.
Take pear halves and cut vertically into quarters. If they are quite large, halve again vertically. Place in a 9x13 baking pan, along with the wedges of red onion. Add thyme, and sprinkle salt over everything. Pour olive oil and maple syrup over everything, and gently toss with hands to coat all.
Bake for 25 minutes, then turn ingredients over. Bake for another 20 minutes, until ingredients are browned and caramelized. Remove from oven, and discard thyme sprigs.
Heat a non-stick skillet to medium high. Add slices of halloumi and cook for 1-2 minutes on each side, until browned and soft.
Add halloumi to pan and toss with other ingredients. Empty onto a serving plate, and toss with toasted pepita seeds. Serve.
Leftovers will keep in the refrigerator for up to 3 days.