01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, and salt until evenly blended.
03 - In a large mixing bowl, beat softened butter, brown sugar, and granulated sugar with an electric mixer until light and fluffy, approximately 2 minutes.
04 - Beat in eggs one at a time until fully incorporated, then mix in vanilla extract.
05 - Gradually mix in dry ingredients on low speed until just combined. Do not overmix.
06 - Gently fold in candy-coated chocolates, pretzel pieces, rice cereal, white chocolate chips, marshmallows, sprinkles, and nuts if using.
07 - Drop heaping tablespoons of dough onto prepared baking sheets, spacing cookies 2 inches apart to allow for spreading.
08 - Bake for 9-11 minutes until edges are lightly golden and centers appear slightly underbaked.
09 - Let cookies rest on baking sheets for 5 minutes, then transfer to a wire rack to cool completely.