Preheat the oven to 350°F (175°C) and pour 1 1/4 cups of enchilada sauce into the bottom of a 9 x 12-inch baking dish.
Prepare the poblanos by placing them on a work surface so they sit flat. Make a lengthwise T-shaped slit on one side of each pepper without cutting off the stem, then remove the core and seeds.
Using tongs, roast the poblanos over an open flame (grill, broiler, or stovetop) until the skins are fully blistered, turning often.
Transfer the blistered peppers to a plastic bag or a bowl covered with plastic wrap and let steam for 10–15 minutes. When cool enough to handle, gently scrape off and discard the charred skins, taking care not to tear the peppers. Set aside.
In a large sauté pan over medium heat, brown the ground turkey, breaking it into small pieces with a wooden spoon; season with kosher salt and fresh ground pepper.
Add the chopped onion, minced garlic, finely chopped bell pepper, chopped tomato, and 2 tablespoons cilantro to the pan. Cook over low to medium heat until vegetables soften.
Stir in the ground cumin, oregano, bay leaf, canned tomato sauce, and 1/4 cup water. Adjust salt and pepper if needed, reduce heat to low, cover, and simmer about 15 minutes.
Carefully spoon about 1/2 cup of the turkey mixture into each roasted poblano, then place the stuffed peppers seam-side up in the prepared baking dish over the sauce.
Top each stuffed pepper with about 2 tablespoons of Colby-Jack cheese, cover the dish tightly with foil, and bake until heated through and bubbly, about 30 minutes.
Remove from the oven and serve hot, garnished with cilantro sprigs or chopped scallions.