Preheat oven to 375ºF. Place bacon on rack arranged over baking sheet or on slotted broiler pan and bake until crisp; reserve.
Place oil, about 2 tablespoons, in a bowl with turkey, garlic, grated onion, cumin, coriander, salt and pepper. Form 6 large patties or 12 slider-size patties, making them a bit thinner at the center than the edges for even cooking and flat, even appearance once cooked.
For the ranch dressing, combine sour cream with lemon juice, hot sauce, herbs, salt and pepper. Taste to adjust seasonings.
Heat griddle, grill pan or cast-iron pan over medium-high heat. Cook large patties 5-6 minutes on each side, slider patties 3-4 minutes on each side.