Grease a 13-in x 9-inch pan. Preheat oven to 325°F (165°C).
Cream butter and sugar, about 1 minute. Add all purpose flour, rice flour, and ground hazelnut. Mix until combined. Mixture may be a little crumbly.
Spread evenly onto pan. Mark 24 small squares with a sharp knife. Top each square with a hazelnut in the middle.
Bake for 35 minutes or until lightly golden brown. Remove and cut into squares again while hot. Allow to cool for 10 minutes in the pan. Gently lift squares onto wire rack to cool.
Notes
The first row of squares are a little difficult to lift and may crumble.