Let's cook.
If using wooden skewers, soak 4 skewers in water for at least 15 minutes to prevent burning.
In a medium bowl, whisk together the olive oil, fresh lemon juice, dried oregano, garlic powder, and black pepper to create the marinade.
Add the cubed halloumi, zucchini, red bell pepper, and red onion to the bowl with the marinade. Toss gently to ensure all ingredients are evenly coated.
Thread the halloumi and vegetables alternately onto the soaked skewers.
Heat a grill pan or outdoor grill to medium-high heat. Lightly oil the grates to prevent sticking.
Place the skewers on the hot grill. Cook for 3-4 minutes per side, rotating occasionally, until the halloumi is golden brown and the vegetables are tender-crisp.
Remove the skewers from the grill and serve immediately.
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