First, preheat your oven to 350 degrees F. and slice your baguette, then wash and cut the onions, and peppers into strips.
Next, saute the sausage in a skillet over medium heat for 5-7 minutes on each side.
After that, add the onions and peppers to the skillet and cook everything for an additional 7-8 minutes or until the peppers and onions are soft.
Now, place the baguette slices on a sheet pan and put them in the oven for 3-5 minutes for the bread to toast, remove them from the oven and set them aside.
Afterward, layer the sausage, peppers, onions, and mozzarella cheese on the toasted crostinis.
Last, place them in the oven to bake for 3-5 minutes or until the cheese has fully melted. Remove the finished appetizer and serve immediately.
The calories listed are an approximation based on the ingredients and a serving size of two crostinis. Serve the appetizer while it is hot and storage is not recommended as the grease from the sausage will make the bread soggy.