01 - Combine apple cider, kosher salt, brown sugar, black peppercorns, smashed garlic cloves, bay leaves, and thyme in a large saucepan. Heat over medium, stirring until salt and sugar dissolve. Remove from heat, add cold water, and cool to room temperature. Add ice if needed to expedite chilling.
02 - Place turkey breast in a large sealable container or zip-top bag. Pour cooled brine over the top, ensuring the turkey is fully submerged. Refrigerate for 8 to 12 hours.
03 - In a small saucepan, add cranberries, apple cider, sugar, balsamic vinegar, orange zest, and salt. Bring to a boil over medium-high heat, then reduce to a simmer and cook for 10 to 12 minutes, stirring occasionally, until cranberries burst and the glaze thickens. Remove from heat and set aside to cool.
04 - Preheat oven to 350°F (175°C). Remove turkey from brine, rinse thoroughly under cold running water, and pat dry with paper towels. Rub the turkey breast all over with olive oil, freshly ground black pepper, and thyme.
05 - Place turkey breast on a rack in a roasting pan. Roast for 45 minutes. Brush the turkey with cranberry glaze, then continue roasting for 25 to 35 minutes, brushing with additional glaze every 10 minutes, until the internal temperature reaches 160°F (71°C).
06 - Remove pan from oven and let turkey rest, loosely tented with foil, for 15 minutes before slicing. Serve with any remaining cranberry glaze.