To create The Best Italian Grinder Sliders, simply follow these easy steps:

1. Preheat the Oven: Set your oven to 350°F (175°C).
2. Prepare the Baking Dish: Grease a 9×13-inch baking dish or line it with parchment paper.
3. Assemble the Sliders: Cut the slider buns in half horizontally, keeping the tops and bottoms connected.
4. Layer Ingredients: Place the bottom half of the buns in the prepared baking dish. Start layering with half the provolone cheese, then add the salami, pepperoni, and ham.
5. Add Giardiniera: Sprinkle the chopped giardiniera over the meats for added zing.
6. Finish with Cheese: Top with the remaining provolone cheese to seal in all the flavors.
7. Close the Sliders: Place the top halves of the buns on the layered ingredients.
8. Prepare the Seasoning: In a small bowl, combine olive oil, garlic powder, oregano, and crushed red pepper flakes. Brush this mixture evenly over the tops of the buns.
9. Bake: Cover the dish with aluminum foil and bake for 15 minutes. After that, remove the foil and bake for an additional 5-10 minutes or until the buns are golden brown.
10. Cool and Slice: Remove from the oven and let it cool for a few minutes. Then, slice into individual sliders.
11. Garnish: Optionally, sprinkle fresh basil leaves on top for an aromatic finish.

Following these steps will lead you to a plate full of warm, cheesy, and satisfying Italian Grinder Sliders that will impress anyone you serve them to.