Preheat oven to 400°F and line a large baking sheet with parchment paper.
Scoop out the center seeds and flesh from each zucchini half to create boats, leaving about 1/4-inch border. Sprinkle with salt and let sit for 10 minutes, then pat dry.
In a medium bowl, mix together cream cheese, ranch seasoning, half of the crumbled turkey bacon, and half of both cheeses.
Divide the cream cheese mixture evenly among the zucchini boats, spreading it into the hollowed centers.
Top each boat with remaining cheeses, turkey bacon, and diced tomatoes.
Bake for 25-30 minutes until zucchini is tender and cheese is golden and bubbly.
Sprinkle with fresh chives before serving.