Place the sweet potatoes, 1 tablespoon olive oil, garlic powder, ½ teaspoon rosemary, ¼ teaspoon salt, and ⅛ teaspoon black pepper in a large mixing bowl.
Toss until evenly coated.
Spread the sweet potatoes in a single layer on the prepared baking sheet.
Roast for 25 to 30 minutes, stirring halfway through, until tender and lightly browned.
Heat 1 tablespoon olive oil in a large skillet over medium-high heat.
Add the chicken, 4 minced garlic cloves, 1 teaspoon rosemary, onion powder, ½ teaspoon salt, and ¼ teaspoon black pepper. Cook for 7 to 9 minutes, stirring occasionally, until the chicken is browned and reaches an internal temperature of 165°F.
Stir 1 tablespoon lemon juice into the chicken and remove the skillet from the heat.
Place the Greek yogurt, remaining 1 tablespoon lemon juice, remaining 1 tablespoon olive oil, small minced garlic clove, parsley, ¼ teaspoon rosemary, ⅛ teaspoon salt, and ⅛ teaspoon black pepper in a small bowl.
Whisk until smooth.
Divide the baby spinach among 4 serving bowls.
Top each bowl with equal portions of roasted sweet potatoes and rosemary garlic chicken.
Sprinkle the feta cheese and chopped pecans evenly over the bowls.
Drizzle each bowl with garlic herb sauce.
Notes
Tips and Tricks
Keep the sweet potatoes evenly sized - Cut the sweet potatoes into similar ½-inch cubes so they roast at the same rate. Larger pieces may need a few extra minutes.Watch the garlic - Minced garlic can brown quickly over medium-high heat. If the skillet becomes too hot, reduce the heat slightly to prevent the garlic from burning.Adjust the sauce consistency - Greek yogurt varies in thickness. If the sauce is too thick to drizzle, whisk in a teaspoon of cold water at a time until it reaches the consistency you prefer.Toast the pecans - For a stronger nutty flavor, lightly toast the pecans in a dry skillet before adding them to the bowls. Let them cool before storing.Use fresh lemon juice - Freshly squeezed lemon juice gives the chicken and garlic herb sauce a brighter flavor than bottled juice.
Storing and Reheating
Refrigerating - Store the cooked chicken and sweet potatoes in airtight containers in the refrigerator for up to 3 to 4 days. Keep the spinach, feta, pecans, and garlic herb sauce in separate containers.Reheating - Place the chicken and sweet potatoes in a microwave-safe dish and heat until steaming hot throughout, or until the chicken reaches 165°F. Add the fresh toppings and sauce after reheating.Freezing - Freeze the cooked chicken and roasted sweet potatoes in airtight freezer-safe containers for up to 3 months for best quality. Thaw overnight in the refrigerator before reheating. Prepare fresh spinach and garlic herb sauce when serving.Storing the Sauce - Keep the garlic herb sauce in a covered container in the refrigerator for up to 3 to 4 days. Stir before serving, as a little liquid may separate during storage.