Decide your use: grilling/sautéing for a browned crust, or baking for melted texture.
Pick the substitute that best matches that behavior from the ranked list below.
Apply the listed ratio. For wetter cheeses, drain/press so the surface browns instead of steaming.
Cut to halloumi-like thickness (about ½ inch). Cook hot and dry (preheated pan or grill) for 2–3 minutes per side.
If the substitute tastes blander than halloumi, add a pinch of salt or extra brine-based tang (lemon or vinegar) to your dish.