In a large skillet, heat the olive oil over medium heat. Add the minced garlic and sauté for about 1 minute until fragrant.
Add the cubed chicken thighs to the skillet, cooking for 5-7 minutes until browned on all sides.
Stir in the ras el hanout, ground ginger, and turmeric. Cook for an additional 2 minutes to toast the spices.
Pour in the chicken broth and bring the mixture to a gentle simmer. Reduce the heat to low, cover, and let it cook for about 15-20 minutes, or until the chicken is tender and fully cooked.
In the last few minutes of cooking, mix in the chopped apricots and preserved lemon. Stir well to combine, allowing the flavors to meld.
While the chicken is finishing, prepare the slider buns by lightly toasting them if desired.
Once the chicken mixture is ready, assemble the sliders by placing a generous scoop of the chicken tagine on the bottom half of each bun.
Top each slider with a dollop of Greek yogurt or tzatziki, a sprinkle of fresh cilantro leaves, and a drizzle of harissa sauce for an extra kick if using. Cap with the top half of the bun and serve warm.