Pat the chicken breast dry and season both sides evenly with sea salt, black pepper, and garlic powder.
Heat a grill pan over medium-high heat and lightly coat with a small amount of oil to prevent sticking.
Grill the chicken for 5 to 6 minutes per side until fully cooked and opaque, then set aside to rest for 3 minutes before slicing into strips.
Place the halloumi slices on the hot grill pan for 1 to 2 minutes per side until they develop golden char marks and a softened texture.
In a food processor, combine the cooked chickpeas, Greek yogurt, tahini, and lemon juice, blending until the mixture is completely smooth and velvety.
Spread the high-protein hummus onto a large plate or platter, using the back of a spoon to create a shallow well in the center.
Arrange the sliced grilled chicken, warm halloumi, Kalamata olives, sliced cucumbers, and cherry tomatoes over the hummus base.
Finish the platter with a drizzle of extra virgin olive oil and an extra pinch of black pepper for a savory pop of flavor.