Bushman's bread breakfast pizza with eggs and sausages

Ingredients

• 2 1/2 cup self-raising flour
• 1 teaspoon baking powder
• pinch of salt
• 40 gram butter
• 1 1/4 cup milk, approx
• 1/3 cup garlic-infused olive oil
• 6 portobello mushrooms
• 3 tomatoes, halved
• 3 sausages, cooked, sliced
• 6 eggs
• 3 tablespoon basil pesto
• 1 cup grated pizza cheese (optional)
• a handful of baby spinach leaves (optional)