如何制作美味的馅饼?

材料：

• 1 1/2 杯全麦 flour
• 1/2 teaspoon salt
• 1/2 teaspoon black pepper
• 1/2 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup (1 stick) unsalted butter, diced
• 3/4 cup (100g) chopped onion, diced
• 3/4 cup (100g) chopped green bell pepper, diced
• 3/4 cup (100g) chopped red bell pepper, diced
• 1/4 cup (100g) chopped mushrooms, diced
• 1/4 cup (100g) chopped tomatoes, diced
• 1 tablespoon chopped fresh parsley
• 1 tablespoon chopped fresh thyme

步骤：

1. Preheat the oven to 375°F (190°C).
2. Whisk together the flour, salt, black pepper, baking powder, and baking soda in a large bowl.
3. Add the diced butter, onion, green bell pepper, red bell pepper, mushrooms, and tomatoes to the bowl.
4. Add the parsley and thyme to the bowl.
5. Add the dry ingredients to the wet ingredients in three additions, mixing well after each addition.
6. Fold in the diced tomatoes.
7. Roll out the dough to a 12x18 inch (30x45cm) rectangle.
8. Transfer the dough to a baking sheet lined with parchment paper.
9. Bake for 30-35 minutes, or until golden brown and cooked through.
10. Let cool for a few minutes before slicing and serving.

提示：

• 使用新鲜的食材可以提升馅饼的味道。
• 可以根据自己的喜好添加其他蔬菜，例如青椒或洋葱。
• 馅饼可以被用作早餐、午餐或晚餐的餐品。