Start by preheating your oven to 350 F.
Next, grease a muffin tin with avocado oil and place a wonton wrapper inside. You may want to use two wrappers per cavity, for a thicker "crust".
Brush each wonton with more oil (or a little bit of butter) and bake them in the oven for approximately 6 minutes, or until the wonton wrappers turn slightly golden.
While the wontons are baking, prepare the filling: in a medium bowl, add in the cream cheese, cheddar cheese, mozzarella cheese, chives, scallions, black pepper, and the jalapeños, and mix until well combined.
Once the wontons are done, let them sit for a few minutes to cool.
Then, scoop some of the cream cheese mixture into each wonton cup.
Add a little more shredded cheese on top of each cup, and a slice of jalapeño (if desired).
Bake for 20 minutes, serve immediately, and enjoy!