3/4 cup butter, at room temp
1 cup packed brown sugar
1/4 cup sugar
1 large egg
2 tsp vanilla
2 cups all-purpose flour
1 tsp. baking soda
1/2 tsp. salt
1-2 cups chocolate chips or chopped chunks
Preheat oven to 350F.
In a large bowl, beat the butter and sugars until pale and almost fluffy. Beat in the egg and vanilla.
Add the flour, baking soda and salt and stir or beat on low until almost combined; add the chocolate chunks and stir just until blended.
Drop dough by the spoonful onto a parchment-lined (or buttered) sheet and bake for 10-14 minutes (depending on their size) until golden around the edges but still soft in the middle. Transfer to a wire rack to cool. Sprinkle flaked sea salt on top, if you like. Makes about 2 dozen large cookies.
The more butter and sugar you add will make the cookie thinner/chewier, and more egg and flour you use makes them thicker and cakier. Buy dark chocolate bars and chop them, adding a range of sizes from larger chunks that create dark pools of chocolate in each cookie, to tiny bits that more evenly disperse throughout the dough.