Reheat the bolognese sauce and beans in the pan. If your bolognese sauce is too wet, reduce it over medium heat for 10 minutes or until it has less liquid.
Empty the whole bag of Doritos into the baking dish.
Cover the tortilla chips with 1/2 of the grated cheese.
Scatter the onion over it.
Spoon over Bolognese sauce and beans.
Add pieces of red pepper and olives. Distribute all ingredients evenly.
Sprinkle with the rest of the cheese.
Bake in the preheated oven to 200°C for 10 minutes or until the cheese is melted.
Decorate with slices of avocado.