Examine each breast for uneven thickness. If thicker than 1 inch at any point, butterfly by slicing horizontally through the thickest part, stopping just before cutting all the way through, then opening like a book. Alternatively, pound to even thickness using a meat mallet.

Sprinkle both sides evenly with kosher salt and freshly ground black pepper. For enhanced flavor penetration, season 30 minutes before cooking to allow osmosis to draw salt into the meat fibers.

Fill a wide pot with approximately 1-2 inches of water—enough to generate steam without touching the steamer basket when placed inside. Place your selected aromatics in the water if using.

Heat water to a rolling boil over high heat, then reduce to medium-high to maintain a consistent steam production without rapid water evaporation.

Place chicken breasts in a single layer in the steamer basket with at least ½ inch between pieces to allow steam circulation. If using a bamboo steamer with multiple tiers, position thicker pieces in the bottom tier.

Cover with a tight-fitting lid and steam for 8-15 minutes, depending on thickness (refer to timing chart in recipe notes). For optimal results, avoid lifting the lid during the steaming process.

Use an instant-read thermometer inserted into the thickest part of the breast. The FDA safe minimum internal temperature is 165°F (74°C). If necessary, continue steaming in 1-minute increments until target temperature is reached.

Transfer chicken to a plate and tent loosely with aluminum foil. Rest for 5-7 minutes to allow for carryover cooking and moisture redistribution throughout the protein structure.