Preheat the oven to 350°F and lightly grease the bread pans.
Grate the zucchini, then combine the zucchini, sugar, oil and eggs in a large bowl.
Stir in the Bisquick and salt until well combined.
Fold in the chocolate chips and walnuts.
Divide the batter between the two 9.5X5 loaf pans, filling each about halfway.
Transfer the pans to the center rack in the oven, and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
Allow the bread to cool for 30-60 minutes before cutting.
Notes
Mix Gently: Combine ingredients just until blended to avoid a dense or dry loaf.
Check Early: Ovens vary, so start checking for doneness around the 25-minute mark.
Avoid Overbrowning: If the top browns too fast, tent loosely with foil so the inside can finish baking without burning.
Check Internal Temperature: Quick breads like zucchini bread are done when the internal temp reaches 190–210°F or a toothpick comes out clean with just a few crumbs. Use a digital thermometer for best results!