Preheat the oven to 375°F.

In a bowl, combine garlic powder, ground black pepper, salt, and dried oregano.

Put a piece of chicken breast on a cutting board and cut three-quarters of the way into the chicken breast to create a pocket on the side.

Repeat with the remaining pieces and put them on a lined baking pan.

Season the chicken with one-third of the spice blend and olive oil. Rub the chicken to distribute the seasoning evenly.

Then, season the sweet potatoes and asparagus with the spice blend and 1 ½ tablespoons of melted unsalted butter. Toss to coat evenly. Let them sit and marinate for 10 minutes.

Move the potatoes to one side of the pan and arrange the asparagus on the other side. Put lemon slices on the chicken. Place in the oven and bake for 10 minutes.

Once done remove the asparagus from pan and place the others back in the oven. Allow the chicken to cook for another 10 minutes.

Remove the pan from the oven, slice chicken breast and serve with sweet potatoes and asparagus.