Use a grater with half of the lemon to create the fresh lemon zest until you have 1 tsp. Add the zest to a bowl.
Add the butter, olive oil, minced garlic, and garlic powder to the zest. Stir until combined. Lift the skin of the chicken breast and place 2 tbsp of the garlic butter mixture on each side. Carefully massage the chicken breast to move the garlic butter mixture throughout the breast.
Add a tbsp of the garlic butter mixture to the outside of the chicken and rub it all over the skin of the chicken. Slice the lemon and onion in half and stuff the inside cavity of the chicken with both the onion and the lemon. Place the chicken into a dish or roasting pan or dish large enough for the chicken. Place the chicken into the oven and then turn the temperature down to 375 degrees Fahrenheit.
Roast the chicken in the oven for 1 hour and 10- 1 hour and 20 minutes. Use a thermometer to ensure the thickest part of the chicken breast is 165 degrees Fahrenheit before removing from the oven. Remove the chicken from the oven and allow to cool for 5 minutes before cutting into servings. For decoration, serve on a plate with lettuce leaves and slices of lemon.
Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.
Shred and freeze leftovers for up to a month in an airtight container in the freezer.
Serve with lettuce, noodles, rice, on sandwiches, and more.
*Nutritional information is a calculated guesstimate. Please note that this can change with different brands and modifications you may make to the recipe. For the most accurate information, use a nutritional calculator with the exact brands and measurements you're using with each recipe.