Make the Lime Crema: combine all ingredients in a small bowl and mix well. Set aside.
In a large skillet over medium heat, brown the ground turkey and onions. Do not drain liquid. Remove from heat and stir in the garlic powder, salt, paprika and cayenne. Set aside.
Combine all of the ingredients for the rice seasoning in a bowl. Stir the seasoning into the cooked rice. Divide rice evenly between 4 bowls.
Divide the ground turkey between the bowls. Arrange the black beans, corn and avocado in each bowl. Drizzle the Lime Crema over top and sprinkle with grated Cojita cheese. Garnish with cilantro, scallions and fresh lime wedges.