Preheat and Prep: Heat your oven to 350°F (175°C). Line two baking sheets with parchment paper or silicone mats.
Cream the Butter and Sugars: In a large bowl, beat softened butter with granulated and brown sugars until light and fluffy — about 2–3 minutes.
Add Eggs and Vanilla: Beat in the eggs, one at a time, followed by the vanilla extract. The mixture should look creamy and smooth.
Combine Dry Ingredients: In a separate bowl, whisk together flour, baking soda, and salt. Gradually add to the wet ingredients, mixing until just combined.
Fold in the Good Stuff: Stir in semi-sweet chocolate chips, white chocolate chips, and crushed peppermint. Don’t overmix — the dough should feel soft but not sticky.
Scoop and Bake: Drop rounded tablespoonfuls of dough about 2 inches apart on the prepared sheets. Bake for 10–12 minutes, until edges are lightly golden but centers still look soft.
Cool and Decorate: Let cookies cool on the pan for 5 minutes, then transfer to a wire rack. For an extra festive touch, drizzle melted white chocolate over the tops and sprinkle more crushed peppermint before it sets.