Preheat oven to 375 degrees.

Spray an 8 by 8-inch baking dish with Pam baking spray

Using a large mixing bowl, add the flour, baking soda, salt and brown sugar whisk to combine

Use you fingertips as needed to break up the brown sugar.

Add butter, and using your fingers / hands , mix the butter into mixture- it will resemble small crumbs

Prepare the raspberries by adding them in a bowl with the sugar and cornstarch and mix using a electric mixer on low until combined

Use 3/4 of the crumb mixture and place in the baking pan.

Press the mixture evenly throughout the pan to create a crust

Spread raspberry mixture over the crust, leaving about a 1/4-inch of all edges.

Sprinkle the remaining crumb mixture all over the raspberries and lightly pressing down

Bake in preheated oven for 30- 32 minutes, until a light golden brown on top

Remove from oven and cool completely before cutting into squares.