Preheat oven to 325°F. Grease 2 loaf pans with butter or cooking spray, or line pans with parchment paper.

In a large bowl mix together zucchini, Greek yogurt, allulose, and vanilla with a wooden spoon until thoroughly combined. Add oil and egg and mix well to blend in.

Add Carbquik, protein powder, baking soda, baking powder, cinnamon, pumpkin pie spice, and salt. Stir until just incorporated and everything "looks wet". It's okay to have a few lumps.

Pour half of the batter into each loaf pan and sprinkle chocolate chips over the top of one or both loaves (they will sink as the bread bakes). Bake 45-50 minutes uncovered, swapping sides in oven halfway through baking.

Remove from oven and let cool 15 minutes in loaf pans. Remove from pans to wire rack to cool completely, or at least as long as you can stand, before cutting. Because slicing while still slightly warm and smearing with butter is delicious. Enjoy!