Cook the rice and keep warm. Slice onion and peppers into strips. Mix chicken seasoning in a small bowl. Mince garlic and chop parsley and cilantro.
Preheat griddle to medium-high heat. Season chicken thighs with onion powder, garlic powder, cumin, chili powder, and lime juice. Place on hot griddle and sear until browned on the first side, then flip and sear the other side.
While chicken cooks, toss onion and peppers with lime juice, salt, and the same seasoning mix used for the chicken.
Once chicken is seared on both sides, move it to the cooler side of the griddle to keep warm. Add seasoned onions and peppers to the hot side and cook until softened with light char marks.
For the adobo ranch sauce, mix sour cream, adobo chiles, garlic herb ranch seasoning, lime juice, garlic, parsley, Mexican oregano, and black pepper until smooth.
Slice chicken. Build bowls with rice, sliced chicken, vegetables, and a drizzle of adobo ranch. Garnish with cilantro and serve with warm tortillas.