Japanese Pizza Toast

Bahan-bahan (3 porsi)

• 1 Tbsp extra virgin olive oil
• ¼ tsp crushed red pepper (red pepper flakes) ((plus more for serving, to taste))
• 1 clove garlic ((minced or crushed))
• 3 Tbsp ketchup ((or 2 whole tomatoes, canned))
• ⅛ tsp Diamond Crystal kosher salt
• ⅛ tsp freshly ground black pepper
• 3 slices shokupan (Japanese milk bread) ((¾ inch, 1.5 cm thick per slice))
• ⅛ sweet onion
• ⅛ green bell pepper
• 4 cherry tomatoes
• 3 slices ham
• 6 Tbsp shredded mozzarella cheese ((or more, if you'd like))