Creating Ooey Gooey Bars can be an enjoyable process if you follow these simple steps:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C). This ensures even baking right from the start.
2. Prepare the Baking Pan: Grease a 9×13-inch baking dish with cooking spray or line it with parchment paper for easy removal later.
3. Mix Butter and Sugar: In a large mixing bowl, combine the melted butter and brown sugar. Mix until well blended.
4. Add Eggs and Vanilla: Beat in the eggs one at a time, then mix in the vanilla extract until the mixture is smooth and glossy.
5. Combine Dry Ingredients: In a separate bowl, whisk together the flour, baking powder, and salt.
6. Incorporate Dry Ingredients: Gradually add the dry mixture to the wet ingredients, stirring gently until just combined. Take care not to overmix.
7. Fold in Mix-Ins: If desired, fold in the chocolate chips and nuts to add flavor and texture to the bars.
8. Pour into the Pan: Spread the batter evenly in the prepared baking dish. Don’t worry if it’s not perfectly smooth; it will bake beautifully.
9. Bake: Place in preheated oven and bake for 25-30 minutes. The edges should be set, while the center remains gooey but not liquid.
10. Cool Down: Once done, remove from the oven and allow the bars to cool in the pan for about 30-45 minutes before cutting into squares.

These steps will help you create Ooey Gooey Bars with ease, all while ensuring that the finished product is both visually appealing and delicious!