01 - 
                Set oven to 175°C and allow to fully preheat.
              
              
              
                02 - 
                Combine shredded chicken breast with garlic powder, onion powder, salt, and pepper in a small bowl. Mix thoroughly so the chicken is evenly seasoned.
              
              
              
                03 - 
                Spread a thin layer of butter on one side of each bread slice.
              
              
              
                04 - 
                Arrange two slices of buttered bread, buttered side down, on a baking tray lined with parchment.
              
              
              
                05 - 
                Divide the seasoned chicken mixture evenly over the bread. Top with sliced avocado, followed by a generous layer of shredded cheddar cheese.
              
              
              
                06 - 
                Place the remaining two bread slices on top, buttered side facing up.
              
              
              
                07 - 
                Transfer the tray to the oven and bake for 10-15 minutes, until cheese is melted and bread is golden and crisp.
              
              
              
                08 - 
                Remove from oven and allow sandwiches to cool for several minutes. Slice each sandwich in half and serve warm.