I always start by preheating my oven to 350°F so it's fully heated by the time my sliders are assembled. This step matters more than people think, since sliding a cold tray into an oven that isn't ready yet can lead to uneven baking. While it heats up, I get my baking dish greased and ready to go.
Next, I whisk my eggs with a pinch of salt and pepper, then cook them in a lightly buttered skillet over medium heat. I pull them off just before they look fully set, since they'll keep cooking once they're in the oven. Undercooking them slightly here keeps the eggs soft instead of dry.
I slice all my brioche buns in half and set the bottom halves right into my greased baking dish, keeping them connected as one slab if possible. Then I layer the turkey slices across the buns first, followed by the scrambled eggs, a sprinkle of chives, and finally the pepperjack cheese slices on top of that.
Once everything is layered, I place the top halves of the buns back over the fillings. This step turns the whole tray into one big connected slider block, which makes it so much easier to serve later. I press down gently just to help everything settle together.
I brush the melted butter generously over the tops of the buns, making sure to get into every little crevice. This is what gives the sliders that golden, slightly crisp top once they come out of the oven. Skipping this step really does change the final texture.
After the butter, I sprinkle the shredded mozzarella and parmesan evenly across the top. I like a generous layer here since this is what creates that irresistible cheesy crust. Feel free to add a little extra if you're a cheese lover like me.
I slide the tray into the oven and bake for 15 to 20 minutes, until the cheese is fully melted and the tops are golden brown. I keep an eye on it toward the end since ovens vary and I don't want the buns to over-brown.
Once it's out of the oven, I let the tray rest for a couple of minutes before slicing the sliders apart. This little pause helps the cheese set slightly so it doesn't slide everywhere when I cut them. Then I serve them warm, straight from the dish.