Assemble the Quesadillas: Lay the tortillas on a flat surface.
Sprinkle about ¼ cup of dairy-free cheese over one half of each tortilla.
Top the cheese with a heaping tablespoon of salsa and a few slices of avocado.
Fold the empty half of the tortilla over the filling, pressing down gently.
Cook to Perfection: Heat a large non-stick skillet or cast-iron pan over medium-high heat for 2 minutes, then reduce the heat to medium. Carefully place 1 or 2 quesadillas in the hot, dry skillet.
Cook for 2 to 3 minutes per side, or until the tortilla is golden brown and crispy and the cheese is fully melted.
Keep Warm & Repeat: As the quesadillas finish cooking, transfer them to a baking sheet and place them in a preheated 300°F / 150°C oven to keep warm.
Repeat the cooking process with the remaining quesadillas.
Serve and Enjoy: To serve, slice the warm quesadillas into wedges.
Serve immediately with the remaining black bean and corn salsa and a generous dollop of vegan sour cream.
Don't overstuff your quesadillas! It's tempting to load them up, but a thinner layer of filling ensures everything heats through and the quesadilla holds together when you flip it.