Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer). Peel and chop onion and garlic.
Heat the oil in a pan. Sauté the onion and garlic until transparent. Add minced meat and fry for about 5 minutes until crumbly. Stir in tomato paste and sweat briefly. Season well with salt and cayenne pepper.
Deglaze with 200 ml water, bring to the boil and simmer for about 5 minutes.
Spread the chips in a large round casserole dish (approx. 26 cm Ø). Spread the chopping mass on the chips. Grate the cheese on top. Bake in a hot oven for about 10 minutes. Drain the pepperoni and cut into rings.
Sprinkle chopped tortillas with pepperoni.