Preheat your oven to 450°F (230°C). Place whole red peppers on a baking sheet lined with parchment paper.
Roast the peppers for 20-25 minutes, turning occasionally, until the skin is charred and blistered all over.
Transfer the hot peppers to a bowl and cover with plastic wrap or a clean kitchen towel. Let them steam for 10 minutes to make the skins easier to remove.
Once the peppers have cooled slightly, gently peel off the skin. Remove the stems, seeds, and membranes.
Slice the peppers into 1/2-inch strips and place them in a bowl. Add half the olive oil, lemon juice, minced garlic, oregano, and a pinch of salt and pepper. Toss gently and set aside to marinate.
Pat the halloumi slices dry with paper towels. For extra flavor, sprinkle a light dusting of dried oregano and black pepper on both sides of each slice.
Heat a grill pan or skillet over medium-high heat. Brush with the remaining olive oil.
When the pan is hot, add the halloumi slices and grill for 2-3 minutes per side until golden brown with beautiful grill marks.
Arrange the grilled halloumi on a serving platter. Top with the marinated roasted red pepper strips.
Drizzle with any remaining marinade from the peppers and, if desired, a light drizzle of honey or balsamic glaze.
Garnish with fresh herbs and a sprinkle of red pepper flakes. Serve immediately.