Combine warm water, honey and yeast in bowl; whisk well and let sit until foamy, about 5 minutes.
Combine flour, baking powder and salt in the bowl of a stand mixer with a hook attachment; mix well on low speed. Pour in yeast mixture and olive oil slowly while mixing until slightly combined. Increase speed to medium-high and mix until a very soft dough is formed, about 4 minutes. Shape pizza dough into a ball; cover and let rise for 30 minutes.
Preheat oven to 220 C / Gas 7. Grease a 30cm round pizza pan (or very large baking tray) with olive oil.
With greased hands, press dough onto the pizza pan. Brush dough with tomato passata.
Bake in the preheated oven until slightly golden, about 15 minutes.
Top pizza base with mozzarella cheese, tomato slices and basil leaves. Bake until cheese is bubbly, 8 to 10 minutes.