Slice the chicken breast into thin strips and season evenly with sea salt, black pepper, and dried oregano.
Heat the olive oil in a non-stick skillet over medium-high heat.
Add the chicken to the skillet and sear for 3-4 minutes per side until golden brown and cooked through, then remove from the pan.
Slice the halloumi cheese into thick rectangles and place them in the same hot skillet, grilling for about 1-2 minutes per side until charred and softened.
While the cheese grills, dice the cucumber and halve the cherry tomatoes.
Spread the hummus in a thick layer across the bottom of a wide bowl or platter.
Arrange the grilled chicken, warm halloumi, cucumbers, tomatoes, and olives on top of the hummus.
Drizzle with fresh lemon juice and serve immediately while the cheese is still warm.