Preheat oven to 425 degrees and line a baking sheet with parchment paper.
Carefully cut the spaghetti squash lengthwise in half and using a spoon remove the seeds.
Place cut side down on the baking sheet and cook for 30-45 minutes in the oven.
Remove from the oven. Add 1 cup of sauce in each of the squash cavities along with mushrooms, peppers, pepperoni slices and sprinkle mozzarella cheese.
Return the spaghetti squash to the oven and bake for an additional 15-20 minutes or until cheese is bubbly. Serve!
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