Dry the halloumi cubes with a paper towel.
In a large saucepan, heat 1-2 tablespoons of olive oil over medium heat. Add mushrooms, crushed garlic, soy sauce, and sweet chili. Cook (stirring occasionally) until mushrooms are lightly browned, about 5 minutes.
Reduce heat to low and simmer until mushrooms are soft, 5 to 8 more minutes. Remove the mushrooms to a small bowl.
In the same pan, add a little oil and turn the heat on to high—Fry the halloumi cubes or slices on all sides until nicely browned.
Arrange the veggies in a serving bowl.
Just before serving, add the sautéed mushrooms and fried halloumi.
Place all the dressing ingredients into a jar. Shake it, and drizzle about half over the salad. Toss well, adding more dressing if needed.
*Optional* Garnish with sesame seeds.