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 well 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, ensuring each is fully incorporated before adding the next. Stir in vanilla extract.
05 - Gradually mix the dry ingredients into the wet mixture on low speed until just combined. Avoid overmixing.
06 - Gently fold candy-coated chocolates, pretzel pieces, rice cereal, white chocolate chips, marshmallows, sprinkles, and nuts if using until evenly distributed throughout the dough.
07 - Drop heaping tablespoons of dough onto prepared baking sheets, leaving 2 inches of space between each cookie to allow for spreading.
08 - Bake for 9 to 11 minutes until edges are lightly golden. Centers should appear slightly underbaked for optimal texture.
09 - Let cookies rest on baking sheets for 5 minutes to set, then transfer to a wire rack to cool completely.