If the tenderloins are uneven in size, use a meat mallet to pound them to an even thickness for uniform cooking. Pat them dry with paper towels.
In a large bowl, season the chicken breast tenderloins with salt, black pepper, dried thyme, and paprika. Make sure to coat evenly.
Add 2 tablespoons of butter to a large skillet over medium heat. Let the butter melt and become bubbly.
Add the seasoned chicken tenderloins to the skillet in a single layer. Cook for 4-5 minutes on one side without moving them.
Flip the chicken pieces and cook for another 4-5 minutes, or until they reach an internal temperature of 165°F (75°C) and are golden brown.
In the last minute of cooking, add the minced garlic to the skillet. Stir gently for about 30 seconds until fragrant, being careful not to burn the garlic.
Remove the skillet from heat and stir in the remaining 2 tablespoons of butter and lemon juice. Toss the chicken in the garlic butter until well coated.
Plate the chicken tenderloins, drizzling the garlic butter sauce over the top. Garnish with fresh chopped parsley.