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Place the chicken thighs and half of the sliced onions into a large sealable plastic bag (like a Ziplock bag).
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Add the fajita seasoning to the bag, then use your hands to rub the seasoning evenly onto the chicken.
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Seal the bag and refrigerate for 5–6 hours, or overnight for the best flavor.
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Preheat a Ninja Griller or BBQ grill.
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Remove the chicken thighs from the bag and grill them for 15–18 minutes, or until almost fully cooked.
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Set the chicken thighs aside.
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Heat a sauté pan over medium heat. Add the bell peppers and remaining sliced onions.
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Cook for 6–8 minutes, stirring occasionally, until tender.
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Set the mixture aside.
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Place the tops of the slider buns on one baking sheet and the bottoms on another.
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Preheat your oven to 350°F.
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While the oven preheats, melt the butter in a small bowl.
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Add the minced garlic and Tajín seasoning, stirring to combine.
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Brush the Tajín butter mixture over the tops of the slider buns.
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Once the oven is ready, bake both sheets of buns for 5 minutes.
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In another small bowl, mash the avocados into a chunky consistency.
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Spread the mashed avocado generously onto the bottom of each slider bun.
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Place a grilled chicken thigh on top of the mashed avocado, pressing lightly so it adheres.
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Add 1 tablespoon of salsa over each piece of chicken.
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Top the salsa with the cooked pepper and onion mixture.
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Sprinkle minced cilantro over everything for a burst of fresh flavor.
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Place the tops of the slider buns over the filling to complete the sliders.
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Serve and Enjoy.