1. For thicker bars use a 9x9 inch pan and bake 28 to 34 minutes 2. For extra gooey blondies underbake slightly and cool fully before cutting 3. Swap semisweet chips for milk chocolate or white chocolate chips 4. Add 1 tbsp water or milk if batter is very stiff 5. Store airtight at room temperature up to 3 days or freeze up to 2 months