In a bowl, combine the chicken pieces with 1 teaspoon kosher salt, grated ginger, minced garlic, 1/2 teaspoon garam masala, 1/4 teaspoon ground turmeric, 1/4 teaspoon chili powder, and the lemon juice. Toss to coat and set aside.
Heat a large skillet over high heat. Add 1 teaspoon clarified butter. When the butter is hot, add half of the seasoned chicken in a single layer (do not overcrowd). Cook until browned and cooked through, about 5 minutes, stirring once halfway through. Transfer the cooked chicken to a plate.
Add a second 1 teaspoon clarified butter to the skillet. Add the remaining chicken and cook until browned and cooked through, about 5 minutes, stirring once. Transfer this cooked chicken to the plate with the first batch.
Reduce the heat to medium-high and add the remaining 1 teaspoon clarified butter to the skillet. Add the diced onion and cook, stirring occasionally, until the onion is golden, about 3 to 4 minutes.
Add the sliced green chili pepper(s), cauliflower rice, the remaining 1 teaspoon kosher salt, the remaining 1/2 teaspoon garam masala, and the remaining 1/2 teaspoon ground turmeric to the skillet. Stir to combine.
Cook, stirring occasionally, until the cauliflower rice is tender, about 6 minutes.
Return the cooked chicken to the skillet, stir to combine, and heat through for 1–2 minutes. Remove from heat.
Stir in the chopped cilantro and serve the biryani with lemon wedges.