1. Preheat the Oven: Set your oven to 360°F and grease a muffin tray (or use a silicone muffin tray with cooking spray) to ensure the muffins release easily.

2. Mix the Dry Ingredients: In a large bowl, whisk together the flour, baking powder, salt, and dried Italian herbs until well combined.

3. Mix the Wet Ingredients: In a separate bowl or jug, whisk together the tomato purée, olive oil, and egg until the mixture is smooth and emulsified.

4. Combine the Batter: Pour the wet ingredients into the dry ingredients and stir gently until just combined. Be careful not to overmix, as this can result in tough muffins.

5. Fold in the Toppings: Gently fold in the grated cheese, diced ham (or your preferred pizza toppings), and spinach (if using) until evenly distributed throughout the batter.

6. Fill the Muffin Tray: Scoop the batter into the prepared muffin cup, filling them evenly to ensure uniform baking.

7. Bake to Perfection: Place the muffin tray in the preheated oven and bake for 15-20 minutes, or until the muffins are cooked through and golden brown on top.

8. Serve and Enjoy: Allow the Pizza Muffins to cool slightly before serving. They can be enjoyed warm or at room temperature, making them a versatile snack or meal option.