Mince the garlic into small bits. You should have AT LEAST one clove per piece of chicken, plus some extra. Set aside.
Remove rosemary leaves from the stems and mince fresh rosemary leaves into small pieces. Set aside.
Trim any fat from chicken thighs and place them into a gallon-sized zip-seal baggie.
Drizzle extra virgin olive oil over the chicken. Close the zip-top and move the chicken around to distribute the oil across all the chicken in the bag.
Next, add freshly minced garlic. You should have at least one clove per piece of chicken. Work to distribute the garlic evenly across the chicken.
Sprinkle in 1.5 tablespoons of freshly minced rosemary. Evenly distribute this across the chicken in the bag as well.
Close the top and set the chicken in the refrigerator to marinate. My grandparents marinated it for just one hour before cooking. I've also left the rosemary garlic chicken thighs in the fridge to marinate for up to 24 hours! Delicious every time.
After marinating, space out the chicken in a glass baking dish. Top off with more minced garlic and rosemary in any areas that look bare. (You'll be able to tell.)
Add a light sprinkling of paprika, salt, and pepper, to taste. (These are not the most important ingredients and I've made the recipe without one or the other at any given point in time.)
Cover with foil and bake at 375 degrees, turning over once. Depending on the size of your chicken and how tightly you pack the pan, cooking times may vary. For my needs, I find that one hour is usually pretty close for chicken drumsticks and thighs. Check chicken with a meat thermometer. The rosemary boneless chicken thighs are done when it's lightly browned and reaches 165-170 degrees internally.