• Preheat oven to 350℉ and spray a baking dish with cooking spray.

Make The Crust and Crumble Topping

• In a large bowl melt the butter in the microwave until melted. Add the sugars and mix until combined.
• Add in the flour oats and vanilla and mix until everything is fully combined. The mixture will be dry with crumble pieces.
• Set 1 cup of the crust mixture aside.
• Move the remaining mixture to the baking dish and using your hands or a spatula hard pack the mixture to create a smooth and flat bottom layer.
• Place in the oven for 10 minutes.

Make the Filling

• In a medium bowl combine the cream cheese, Greek yogurt, sugar egg and vanilla. Whisk until combined.
• Evenly pour the filling over the top of the crust layer and smooth it out.

Make the Blueberry Layer

• Mix 1 tablespoon of corn starch with 1/4 cup of water. Set aside.
• In a medium saucepan over medium-high heat add the frozen blueberries, sugar, and vanilla.
• Give a stir and pour in the water and corn starch mixture. Bring to a boil while stirring constantly. After about a minute the blueberry mixture will have thickened up. Remove from heat.
• Evenly pour the blueberry mixture over the top of the filling mixture.
• Evenly sprinkle the remaining 1 cup of the crust mixture.

Bake the Bars

• Bake for about 40 minutes or until the top of the crumble is set and lightly golden brown.
• Let cool 1-2 hours before serving. If you cut in the bars before they are cool you will have very messy bars that will more than likely fall apart.