Salmon, spinach, mushroom, feta flatbread pizza

Ingredients

• 1 package of store-bought pizza dough
• 1/2 pound mushrooms, sliced
• spinach, washed thoroughly
• 2-3 oz feta cheese, crumbled
• 1 salmon fillet, uncooked and diced
• 1 clove garlic, diced
• olive oil
• powdered garlic
• salt and pepper to taste
• crushed red pepper, oregano