Vegan White Sauce Pizza with Lebanese Bread (30 Mins Meal)

Name: Vegan White Sauce Pizza with Lebanese Bread (30 Mins Meal)
Prep time: 15 min
Cook time: 10 min
Total time: 25 min
Cuisine: Italian, American
Ingredients: 2 pcs Lebanese bread; ½ pc small red onion ((thinly sliced)); ¼ pc yellow bell pepper ((sliced into strips)); ¼ pc red bell pepper ((sliced into strips)); ¼ pc green bell pepper ((sliced into strips)); 4 pcs mushrooms ((thinly sliced)); 1 cup vegan cheese ((grated)); 1 cup soy milk (or oat milk); 1 tbsp garlic (minced); 2 tbsp all-purpose flour; ⅓ tsp salt; pinch black pepper