Why is my grilled chicken hard?

Online Answer
Overcooking. One of the leading causes of rubbery chicken is overcooking the meat. Chicken is to be cooked quickly with relatively high heat. Since most boneless skinless breasts aren't the same thickness, it makes it difficult to cook them evenly.
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9″ x 13″ Baking Pan or Casserole Dish. Finally, any large but shallow baking pan will work, whether it's your 9″ by 13″ cake pan or your favorite casserole dish. Shallow sides are best so that your chicken browns instead of steams.
If you've ever cooked a chicken breast and had it turn out tough and chewy, it might not have been your fault. ... Woody breast is believed to affect 5% to 10% of the chicken breasts on the market, and though not a health threat to humans, it's certainly not pleasant to eat..
Cut the chicken into small enough pieces to make sure it cooks all the way through. Fry pieces of similar size together so they all cook through using the same amount of time.
Yes, you can reheat chicken breast in a microwave. Place the chicken breast on a microwave-safe plate and wrap with microwavable plastic wrap or cover with wetted paper towel. Microwave the chicken breast for 1 to 2 minutes with periodic checking and flipping it over in 30 seconds.
You can also use baking soda to tenderize chicken and pork. ... Baking soda is also used a lot on meat and poultry for stir-frys. The general rule is 1 teaspoon baking soda per pound of meat when using it as a tenderizer. For individual tender steaks, like a rib-eye, stick to a marinade or a commercial meat tenderizer.