Creating cut pastrami brisket sliders is straightforward when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Pastrami: If using a whole brisket, slice the pastrami thinly against the grain.
3. Seasoning: In a bowl, mix the garlic powder, onion powder, salt, and pepper. Lightly coat the sliced pastrami with olive oil and season generously.
4. Heat Pastrami: In a skillet over medium heat, warm the pastrami slices for about 5-7 minutes, allowing the flavors to meld.
5. Prepare Buns: While the pastrami is warming, slice the slider buns in half horizontally.
6. Layer Cheese: Place half of the sliced Swiss cheese on the bottom halves of the buns in a large baking dish.
7. Add Pastrami: Layer the warmed pastrami over the cheese, distributing evenly across all buns.
8. Top with Remaining Cheese: Place the rest of the Swiss cheese on top of the pastrami to create a cheesy layer.
9. Add Mustard: Drizzle yellow mustard over the cheese to enhance the flavor and moisture.
10. Top with Coleslaw and Pickles: If desired, add coleslaw and pickle slices for additional crunch and flavor.
11. Cover with Buns: Place the top halves of the slider buns on the assembled fillings.
12. Bake: Cover the baking dish with aluminum foil and bake for 20 minutes. Remove the foil and bake for an additional 10 minutes until the cheese is melted and the buns are slightly crisp.
13. Resting Time: Allow the sliders to rest for about 10 minutes once removed from the oven for easier handling.
14. Cut and Serve: Cut the sliders into individual portions and serve warm.

These steps will guide you in crafting these delightful sliders that will wow your family and friends!