Prepare the dough: add luke-warm water to dry yeast and add a teaspoon of flour. Mix well, cover with a cloth and let rise for about 10 minutes. In a separate bowl, place flour and a pinch of salt. When the yeast rises, add it to the flour. Add olive oil and combine well with a fork, then proceed to kneading the dough by hand for about 10 minutes, until the dough is smooth and flexible. Cover with a cloth and let rise for an hour.
After an hour, knead out the dough and divide into 2 pieces. Roll each dough piece out into a pizza shape (round, rectangle or free-style).
Cover baking tray with baking paper to prevent sticking. Preheat oven to 220°C / 428°F. Place pizza dough on baking tray. Spread tomato sauce onto the dough, then top the pizza with ham, sliced zucchini, spinach leaves, grated cheese and mozzarella.
Place pizza in preheated oven and bake for about 12-16 minutes, or until the pizza dough is golden brown. Remove from oven and serve hot.