Put chicken breasts into a pot and cover with water. Heat to a simmer and cook for about 10-15 minutes until chicken is cooked through. Remove chicken from the water and set aside to lightly cool.

Meanwhile, in a small bowl, mix the greek yogurt and lemon juice together until it has a sauce-like consistency. Add in the coleslaw mix and stir to coat. Set aside.

Shred the chicken with two forks and add it to a bowl. Add the barbecue sauce and mix until the chicken is fully coated.

Assemble the sandwich by placing barbecue chicken and coleslaw mixture between the bun. Serve.

Meal Prep Note: store extra barbecue chicken and coleslaw mix in separate airtight containers in the fridge. When ready to serve again, assemble the sandwich. You can reheat the chicken in the microwave beforehand or serve it cold.