1-Start by preheating your oven to 350°F and lining an 8×8 square pan with foil or parchment, then spray it with nonstick spray for easy removal. This nutella stuffed oatmeal cookie bars recipe takes about 45 minutes total, including 15 minutes of prep and 30 minutes of baking, making it perfect for busy schedules.

2-Next, beat the softened unsalted butter and packed light brown sugar together until they’re fully combined, then mix in the pure vanilla extract and large egg. In another bowl, combine the all-purpose flour, old-fashioned rolled oats, baking soda, and salt until everything is blended. Press a bit more than half of this dough into the prepared pan to form the crust, and set the rest aside in the fridge for the topping.

3-After baking the crust for 12 minutes, take it out and dollop the chocolate hazelnut spread on top, spreading it gently. Sprinkle the semisweet chocolate chips over this layer, then break the reserved dough into flat, irregular pieces and place them over the spread. Return the pan to the oven for an additional 18-22 minutes until the top is golden brown. Let the bars cool completely before cutting to avoid any mess, and enjoy them slightly warm for that gooey center everyone loves.