Slice the halloumi into 0.25-inch thick slices.
Heat 0.5 tsp of olive oil in a non-stick skillet over medium-high heat.
Add the halloumi slices and sear for 2 minutes per side until they develop a golden-brown crust.
Remove the halloumi from the pan and set aside.
Add the remaining 0.5 tsp of olive oil and the cherry tomatoes to the same pan.
Cook the tomatoes for 3-5 minutes until the skins begin to blister and burst.
Toss in the baby spinach and cook for 1 minute until just wilted, then remove the vegetables from the pan.
In a small bowl, whisk the egg whites with sea salt, black pepper, garlic powder, and chopped parsley.
Lower the heat to medium and pour the egg whites into the skillet, stirring gently until they are cooked through and fluffy.
Serve the herbed egg whites topped with the seared halloumi and blistered tomatoes.