Prep the veggies. Grate zucchini and squeeze it in a clean towel to remove excess water. If using mushrooms, finely chop and pat dry. The goal: moist, not soggy.
Mix with intention. In a large bowl, combine turkey, grated veggies, onion, garlic, Worcestershire, Dijon, smoked paprika, salt, and pepper. Add egg and breadcrumbs if using. Mix gently with your hands or a fork until just combined—don't overwork.
Shape the patties. Divide into 4 equal portions (about 4–5 oz each). Lightly oil your hands and form 1/2-inch-thick patties. Press a shallow dimple in the center to prevent puffing.
Chill for structure. Place patties on a parchment-lined plate and refrigerate for 15–20 minutes. This helps them hold together on the grill or skillet. Worth it.
Preheat your cooking surface. Heat a cast-iron skillet or grill to medium-high. Add a slick of oil to the pan or brush grates with oil.
Cook like you mean it. Cook patties 4–5 minutes per side, flipping once, until the internal temp reaches 165°F (74°C) . If adding cheese, top during the last minute and cover to melt.
Toast the buns. A quick toast in the pan or on the grill with a tiny bit of oil makes everything taste better. Science (and your taste buds) agree.
Assemble and serve. Stack with your favorite toppings and sauce. Try yogurt-Dijon-lemon for creamy tang without heavy calories.