Laura's "Thin Mint" Brownies

Ingredients (5)

• + 1 (18.25 ounce) package brownie mix (such as Betty Crocker®) add to pantry
• + ⅔ cup vegetable oil add to pantry
• ✓ ¼ cup water
• ✓ 2 eggs
• + 20 chocolate mint layer candies (such as Andes®), or more as needed, unwrapped add to pantry