Preheat oven to 375°F
Add oil and butter to a large skillet over medium-low heat. Add peppers, onions, crushed bouillon, brown sugar, and Worcestershire. Cook about 15 minutes, stirring occasionally until peppers and onions are soft.
In a medium bowl, mix together chicken, garlic powder, salt, and pepper.
Add chicken mixture to the skillet, stir to combine and cook for another 5 minutes.
Split your rolls in half, place the bottom half in a prepared baking dish.
Top the buns with 6 slices of provolone cheese, follow with the chicken mixture, and then the second layer of 6 slices of Provolone cheese.
Place the top half of the buns on top.
In a small bowl, mix together the melted butter, Italian seasoning, and garlic powder.
Brush the top of the rolls with the melted butter mixture.
Bake for 15 minutes or until the cheese is hot and bubbly and the tops of the sliders are golden brown.
Remove from oven, slice and serve.