Pre-heat oven to 325°F. Line cookie sheet with parchment paper (optional).
In a large mixing bowl, beat the softened butter with both sugars until light and creamy.
Add eggs and vanilla extract. Beat until smooth.
Add the gluten-free flour, salt, and baking soda. Mix well.
Stir in the chocolate chips, walnuts, and toffee bits.
To make large cookies, use 1/4 cup measuring cup or a large muffin scoop and drop the cookie dough onto a baking sheet.
Or for a smaller size cookie use a small cookie scoop or spoon to drop the dough onto the cookie sheet.
If making the larger cookie bake approx 15-18 minutes, until the edges are lightly brown.
If making the smaller cookie bake approx 8-11 minutes, until the edges are lightly brown.
Sprinkle lightly with sea salt flakes (optional)
Transfer to a cooling rack to cool completely.