Preheat oven to 400 degrees Fahrenheit
Trim the zucchini ends and then cut zucchini lengthwise in half. Carefully scrape out the flesh out with a small spoon. Chop about ⅓ cup of the remains and set aside
In medium high heat - heat a skillet with olive oil, and sauté diced onion until translucent about 3 minutes. Add in minced garlic until fragrant about 30 seconds
Then add ground beef, cumin, black pepper and garlic salt and combine
Add in the chopped zucchini and combine. Cook until meat has browned. (If too much water accumulates from the zucchini, scoop it out with a spoon.)
Stir in the mild red enchilada sauce and ½ cup of cheddar cheese and combine.
Add more salt if needed. Once the meat mixture starts to bubble up remove from heat.
Spray cooking spray or olive oil on a 13x9 baking dish or cookie sheet big enough for all the zucchini boats. Add the zucchini boats in the baking dish and scoop enchilada meat mixture to the hollowed zucchini boats
Cover with aluminum foil and bake in the oven for 15 minutes. Uncover and sprinkle the remaining ½ cup of shredded cheddar cheese and put back in the oven uncovered for 5 more minutes or until cheese has melted
Serve with chopped cilantro on top.