Preheat your oven to 350°F (175°C). Prepare a baking sheet by lining it with parchment paper.
On the baking sheet, arrange the zucchini strips without overlapping. Sprinkle them with salt and bake for 10 minutes to soften. Remove from the oven and set aside to cool.
While the zucchini is baking, heat olive oil in a large skillet over medium heat. Add diced onion and sauté until translucent, about 3 minutes.
Add the minced garlic to the skillet and cook for another 30 seconds until fragrant.
Increase the heat to medium-high and add the ground beef to the skillet. Cook, breaking it apart with a spatula, until browned and no pink remains, about 5-7 minutes.
Drain excess fat and return the skillet to the heat. Stir in cumin, chili powder, paprika, cayenne pepper, salt, and pepper. Cook for another 2 minutes, allowing the spices to blend with the meat.
Lay the cooled zucchini strips flat on a work surface. Spoon the cooked ground beef mixture onto one end of each zucchini strip. Sprinkle shredded cheddar cheese on top of the beef.
Carefully roll the zucchini strips to enclose the filling and place them seam-side down on the baking sheet.
Place the stuffed zucchini tacos back into the oven for 5 minutes, or until the cheese is melted.
Serve the Keto Zucchini and Ground Beef Tacos warm, garnished with chopped cilantro, lime wedges, and a dollop of sour cream if desired.