Preheat oven to 400°; heat a skillet over med-high, add 2 sausages, ¼ cup water + bring to simmer; cover skillet + cook 5-6 min; remove lid, flip sausages + cook 5-6 min more until water evaporates, sausages are browned on all sides + internal temp is 165°; slice into bite-size pieces, add to a bowl + mix in ½ cup sauce

Slice 2 zucchinis lengthwise + cut off the stem; scoop out the flesh + mix into sausage; place zucchini boats on a sheet pan lined with foil, season with salt/pep + drizzle lightly with oil

Divide sausage mixture between zucchini halves + bake 10-15 min or until zucchinis are hot + slightly softened