BBQ Chicken Grilled Cheese Sandwich

Ingredients:
2 Chicken Breast
2 tbsp Olive Oil
1 Red Onion
3 Garlic Cloves
1/2 tsp Paprika
1 tsp W Sauce
1 cup Savory Brown Sugar BBQ Sauce
Swiss Cheese slices
Brioche Bread or Sour Dough Bread
1 stick Butter
2 Garlic Cloves
2 tsp Parsley