Step 1: Preheat Your Oven - Preheat your oven to 350°F (175°C) for even baking.
Step 2: Cream the Butters and Sugars - In a large mixing bowl, cream together butter and peanut butter. Add sugars and mix until fluffy.
Step 3: Add Egg and Vanilla - Add egg and vanilla, beating until combined and scraping down the bowl.
Step 4: Combine Dry Ingredients - In another bowl, whisk together flour, baking soda, and salt.
Step 5: Mix Dry Ingredients with Wet - Gradually add dry ingredients to wet ingredients until just combined.
Step 6: Fold in Snickers - Gently fold in Snickers chunks evenly into the dough.
Step 7: Scoop and Bake - Portion dough onto a lined baking sheet. Bake for 10-12 minutes until edges are golden.
Step 8: Cool and Enjoy - Cool cookies on the sheet for a few minutes before transferring to a wire rack.