Preheat oven to 400 degrees Fahrenheit. Line a 13 x 9 metal baking dish with parchment paper. In a large bowl, combine melted butter, brown sugar and vanilla extract. Using a hand mixer or a spatula mix until smooth. Set aside.
In a large bowl, combine oats, flour, salt and baking soda. In batches add the oat flour mixture into the melted butter and sugar. Mix until crumbly.
Press half of the mixture into the prepared baking dish to form the bottom layer of the bars. Make sure you spread it out evenly. Spread the raspberry jam filling over the bottom layer of the oats. Sprinkle the remaining oat mixture over the raspberry jam filing.
Bake the bars for 20-25 minutes or until they are golden brown. Allow the bars to cool completely before serving. Enjoy!
Notes
Make sure you line your baking pan with parchment paper for easy removal.