Combine all ingredients for the rice in a medium saucepan and bring to a boil. Let it boil for about a minute, then cover, turn the heat to medium-low and let cook for 40-45 minutes (until all liquid is absorbed).
Meanwhile, preheat the oven to 400 degrees. Combine the sweet potatoes with 1 tbsp olive oil, 1/4 salt, 1/4 pepper, 1/2 tbsp chili powder and 1/2 tbsp cumin. Stir to evenly coat, then lay them in an even layer on a large baking sheet. Roast the potatoes for 20-25 minutes, until lightly brown.
While the potatoes are baking, you are going to cook the turkey in a skillet. Preheat a medium skillet over medium-high heat. Season the turkey with the rest of the salt, pepper, chili powder and cumin. Add 2 tbsp of olive oil to the skillet, and cook for 7-9 minutes, until lightly brown and cooked through.
When all three components are finished cooking, spoon a small amount of the rice, potatoes, and turkey into your lettuce cups. Top with avocado or your favorite sauce and enjoy!