Slice chicken into bite-sized pieces. Season with Salt and Pepper.
To a large skillet over medium-high heat, add the oil and Red Curry Paste- stir around until it warms through-- about 1 minute.
Add the chicken and cook for about 5 minutes, or until chicken is done; flip and stir often to ensure even cooking.
Add the onions, garlic, and frozen vegetables, cook for about 5 minute; stir frequently.
Add the coconut milk. Reduce the heat to medium, and allow mixture to gently boil for about 5 minutes, or until liquid thickens.
Add the brown sugar and lime juice, salt, pepper, etc. to taste. (Now would be the time to add in additional heat, if desired)
Sprinkle with the cilantro and serve immediately