In a small jug, mix the lukewarm water, sugar, and instant yeast, then cover and let it sit for 10 minutes until it starts to foam up.
In a large mixing bowl, combine the flour and salt, then pour in the yeast mixture and stir everything together.
Add 1 to 2 tablespoons of water as needed and mix until a soft dough forms, then add olive oil and knead until the dough is smooth and elastic.
Cover the bowl and let the dough rise in a warm place for 1 to 2 hours until it doubles in size (don’t rush this — the rise makes a difference).
While the dough is rising, heat cooking oil in a frying pan, add the chicken strips, and cook until they turn white and start to brown a little.
Stir in garlic powder, salt, red chili powder, crushed chili, and oregano, cook for 2 to 3 minutes, then add the lemon juice and give it all a good toss.
Add mushrooms, onion, green bell pepper, and red bell pepper, stir-fry for another 2 minutes, and set the pan aside to cool slightly.
Grease your hands lightly with oil, punch down the risen dough, then divide it into two equal parts and roll each one into a 12-inch round on a floured surface.
Place the dough rounds on pizza pans, prick them all over with a fork, then spread the pizza sauce evenly on each one.
Top with the cooked chicken fajita mixture, followed by mozzarella, cheddar, and olives, then bake in a preheated oven at 200°C (about 400°F) for 15 minutes or until golden and bubbly.