Split the whole slider bun sheet by making a cut in the middle so that you have the top layer and the bottom layer of the slider buns sheet separated. You can certainly make one slider at a time, I like to just assemble them all together as a sheet and grill them all at once. Spread butter on cut side of both sheets. Skip this step if making it dairy free, or use dairy free butter.
Spread spicy green chutney on top of the butter layer on both sheets halves. Sprinkle thinly sliced red onions on the bottom sheet, on top of green chutney layer.
Sprinkle chaat masala on top of sliced onions.
Place prepared tikkis on top of onions layer. Place it the way it sits properly on the single bun bottom. So that when you cut the sliders, each slider has its own full tikki!
Sprinkle shredded pepper jack cheese on all the tikkis. Skip this step if making it dairy free, or use dairy free cheese.
Sprinkle generous amount of spicy garlic chutney/achar masala on all the tikkis.
Spread generous amount of sweet tamarind chutney on the other half of the bun sheet, on top of green chutney layer. Place the top bun sheet on top of the bottom bun sheet which is loaded with onions, tikkis cheese etc.
Place light pressure on the sliders so that everything sticks well together, do not press too much so that the tikkis might break.
Spread butter/oil on top of the buns and place the whole thing in a panini maker. Cook in panini maker on 450° F for 6-10 minutes, depending on how crispy and dark you want your sliders. Making sure the cheese is melted inside.
If using outside grill, press the sliders well and place the whole thing in the grill. Cook on medium heat until it starts getting some charred spots on it and the cheese is melted.
Once done, poke toothpick in each slider to secure all the layers.
Slide in sliced jalapeno and cubed pepper jack cheese in each toothpick. Skip the cheese for dairy free option.
Place a tiny dollop of green chutney on each slider. Drizzle some sweet red chutney on all the sliders.
Sprinkle some chaat masala on top of all the sliders. Serve it hot, either let your guests cut their own sliders or you cut them before serving them!