Preheat your heat source. Oven: 425°F (220°C).
Toaster oven: 425°F. Air fryer: 380°F (193°C). Preheating helps the muffins crisp quickly.
Prep the muffins. Split the English muffins and place them cut-side up on a sheet pan or air fryer tray.
Brush lightly with olive oil for extra crunch and flavor.
Toast the base. Pre-toast the halves for 4–5 minutes in the oven or 2–3 minutes in the air fryer until edges are lightly golden. This step keeps the base from getting soggy.
Sauce it. Spread about 1 tablespoon of pizza sauce on each half. Don’t overdo it—too much sauce softens the muffin.
Add cheese. Sprinkle a thin layer of mozzarella first.
This creates a barrier that helps the muffin stay crisp.
Load the veggies. Add spinach, peppers, onions, and tomatoes. Keep the layer light and even so the pizzas cook through quickly.
Top with more cheese. Finish with the remaining mozzarella and a sprinkle of Parmesan. Season with Italian seasoning, a pinch of salt, and black pepper.
Bake or air fry. Oven/toaster oven: 6–8 minutes, until cheese is melted and bubbly.
Air fryer: 4–6 minutes. Check early to avoid over-browning.
Finish and serve. Let them cool for 1 minute. Add red pepper flakes and fresh basil or parsley if you like.
Serve warm.