Preheat the air fryer. Set it to 200°C (390°F) for 3–5 minutes so it’s hot and ready. A hot start helps the chips crisp up faster.
Start the chips. Add the frozen chips to the air fryer basket in a single layer if possible.
Lightly spray with oil and season with a pinch of salt and pepper. Air fry for 10 minutes.
Make the relish base. While the chips cook, heat 1 tbsp olive oil in a small pan over medium heat. Add onion and cook for 3–4 minutes until soft.
Stir in garlic and cook for 30 seconds.
Build the tomato relish. Add cherry tomatoes, tomato paste, vinegar, sugar, a pinch of salt, and black pepper. If using, add smoked paprika and chili flakes. Simmer for 5–7 minutes, stirring now and then, until the tomatoes break down and the mixture thickens slightly.
Adjust to taste. If it’s too sharp, add a touch more sugar.
If it’s too sweet, add a splash more vinegar. You want bright, balanced flavor with a jammy texture.
Shake and continue the chips. After the first 10 minutes, shake the basket to move the chips around. Air fry another 8–12 minutes, until deeply golden and crisp.
Total time will vary by thickness and brand.
Smash into hash browns. Transfer the cooked chips to a bowl. Use a fork or potato masher to gently crush them so the pieces cling together but still look rustic. Taste and season again with salt and pepper if needed.
Crisp the patties (optional but great). Lightly oil the air fryer basket.
Form the crushed chips into 3–4 rough patties, about 1.5 cm thick. Air fry at 200°C (390°F) for 5–7 minutes, flipping once, until the edges are extra crisp.
Fry or poach eggs (optional). If serving with eggs, cook them now so they’re ready to go on top of the hash browns.
Plate and garnish. Top the crispy hash browns with a spoonful of tomato relish. Add a dollop of sour cream or Greek yogurt if you like.
Finish with chopped parsley or chives and plenty of black pepper.