Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.

In a medium bowl, whisk together the flour, baking soda, baking powder, salt, and cinnamon. Set aside.

In a large bowl, whisk the melted butter with brown sugar and granulated sugar until smooth and slightly thickened.

Add vanilla extract and egg, whisking until fully incorporated.

Fold in the dry ingredients using a spatula or wooden spoon until just combined—don’t overmix.

Stir in the chocolate chips, butterscotch chips, and pecans (if using).

Scoop dough into 1.5 tablespoon-sized balls and place on the prepared baking sheet, about 2 inches apart.

Sprinkle each cookie with a little flaky sea salt.

Bake for 10–12 minutes, or until the edges are golden and the centers look just set.

Let cool on the pan for 5 minutes, then transfer to a wire rack.