Preheat the oven to 375° and grease 24-cup mini muffin pan with some spray oil.
Fit a wonton wrapper gently into each muffin cup of the pan to create little cups. Try to press/fold the wrapper folds onto the edge for a more even cup.
Bake for about 7 minutes, until they turn golden brown. Take out of the oven. Let them cool enough to be able to take the cups out of the pan. Gently take out the cups and let them cool to room temperature. That won't take long.
Cut avocados in half and scoop out avocado pulp into a mixing bowl and mash it with a fork.
Seed and mince jalapeno. Mince red onion and dice tomato. Add veggies to avocado.
Squeeze in lime juice and add remaining ingredients to the bowl, mix well. Taste to see if you need more salt.
Fill wanton cups with guacamole and sprinkle some Cotija cheese over the top.
Note: you can use more lime juice (from another lime) to squeeze over the top of each cup to keep it from turning brown longer.