Preheat oven to 180 C. Line a baking tray with baking paper and place the pumpkin slices in a single layer on the tray.
Sprinkle with cumin, salt & pepper. Drizzle with olive oil and roast for 20-25 mins or until tender. Remove from oven and set aside to cool.
Meanwhile, get all of the other ingredients prepared as the next step is to assemble the quesadillas.
Preheat a sandwich press or a frying pan over medium heat. Divide the tortillas into pairs and line them up on the bench.
Separate the two so that you have a top and a bottom. Sprinkle over a light layer of cheddar on one tortilla, then place some roasted pumpkin slices over the cheese. Now sprinkle over some feta cheese, black beans, red onion, jalapeno chilli, and coriander. Now pop the remaining tortilla on top. Repeat with remaining tortillas and filling ingredients.
Place a quesadilla into the sandwich press or fry pan and cook until toasted on the bottom, then flip over to toast the other side and continue cooking until the cheese is melted and the filling is warm. Remove from the pan and keep warm; continue cooking the remaining quesadillas.
Cut the quesadilla into quarters and place it on a serving plate. Top with a dollop of sour cream and a scoop of avocado. Add a spoonful of salsa and some coriander leaves.
Serve with some jalapeño relish on the side for an extra chilli hit.