This zucchini slice has been a quiet favorite in my kitchen for years. I first discovered the concept while flipping through my grandmother's loose collection of recipe clippings: a simple savory bake that used pantry staples and a glut of garden zucchini. I adapted it to our tastes by adding grated carrot for sweetness, a good sharp cheddar for depth, and, when we want it meaty, chopped bacon. The texture is somewhere between a frittata and a quick bread: set eggs give structure while the grated vegetables keep it moist and tender. It is the kind of dish that vanishes at brunch gatherings and turns up as an impromptu dinner when we want something both comforting and quick.

What makes this version special is the balance of textures and flavors. The zucchini must be squeezed to avoid sogginess, the cheese needs to be freshly shredded for melt and flavor, and the eggs are whisked with oil to give a golden top and moist interior. I often make this when zucchini floods our summer box from the farmers market; it stores well, reheats beautifully, and is forgiving of swaps. Serve warm from the pan with a crisp salad, or cool and cut into squares for lunchboxes — either way, it becomes one of those recipes people ask for again and again.

Ingredients

• Yellow onion: One medium sweet yellow onion, diced finely. It softens and melts into the batter, adding gentle natural sweetness. I look for firm onions without green shoots.
• Bacon: One cup raw bacon, chopped into small pieces. For deeper flavor use thick-cut bacon; cook ahead if you prefer crispiness, or add raw for convenience.
• Zucchini: Two and a half cups shredded zucchini measured after grating. Use firm, evenly colored zucchini; do not peel. Grate on the largest setting and squeeze out excess moisture.
• Carrot: One cup grated carrot for color and subtle sweetness. I use matchstick carrots when short on time, but freshly grated carrots give a better texture.
• Cheddar cheese: One and a half cups freshly shredded sharp cheddar. Freshly shredded melts more evenly than pre-shredded blends that include anti-caking agents.
• All-purpose flour: One cup to provide structure — sift if lumpy. For gluten-free options, see substitutions below.
• Baking powder: One and a half teaspoons to give a light lift so the bake is tender, not dense.
• Salt & pepper: Half teaspoon kosher salt and quarter teaspoon freshly ground black pepper to season the batter.
• Eggs: Five large eggs, whisked with oil to bind and set the slice; use room temperature for best incorporation.
• Olive oil: Half cup for richness and to keep the interior moist; vegetable oil may be used as a neutral alternative.

Instructions

Preheat and prepare the pan: Preheat the oven to 350 degrees Fahrenheit. Line a 9x13-inch glass pan with parchment paper and spray with nonstick spray; parchment helps lift the bake out cleanly and keeps edges from overbrowning. Set the prepared pan aside while you assemble. Combine vegetables, bacon, and cheese: In a large mixing bowl add the diced onion, chopped bacon, shredded zucchini, grated carrot, and shredded cheddar. Stir to combine so cheese and vegetables are evenly distributed. If using raw bacon, small pieces will cook through in the oven; cooked bacon yields crisper texture. Add dry ingredients: Sift or add one cup all-purpose flour, one and a half teaspoons baking powder, half teaspoon salt, and quarter teaspoon pepper to the vegetable-cheese mixture. Stir thoroughly so the dry mix coats the vegetables — this helps absorb moisture and prevents sinking during baking. Whisk wet ingredients: In a separate medium bowl, crack in five large eggs and add half a cup olive oil. Whisk until fully combined and slightly frothy; this aeration aids a lighter texture and ensures even distribution of fat and egg throughout the batter. Combine to form batter: Pour the egg and oil mixture into the bowl with the vegetable and dry ingredients. Use a wooden spoon to fold everything together until a uniform batter forms — it will be somewhat loose but cohesive. Taste and adjust seasoning if needed, remembering cheese will add salt. Pour and bake: Spread the batter evenly into your prepared 9x13 pan. Bake in the preheated oven for 35 to 40 minutes, or until the center is set and a toothpick inserted into the middle comes out mostly dry. The top should be lightly golden. If using muffin tins, check after 12 to 15 minutes for doneness. Cool and serve: Allow the slice to rest in the pan for 10 minutes before lifting out with parchment. Slice into 12 squares and serve warm or at room temperature. Refrigerate leftovers within two hours in an airtight container.

Storage Tips

Store cooled slices in an airtight container in the refrigerator for up to four days. For longer storage, cut into portions and freeze in a single layer on a baking sheet, transfer frozen pieces to a freezer-safe bag and freeze up to three months. Reheat from frozen in a 350 degrees Fahrenheit oven for about 15 to 20 minutes, or thaw overnight in the refrigerator and reheat for 8 to 10 minutes. Use glass containers for even reheating and avoid microwave reheating for long periods to prevent rubbery texture.

Ingredient Substitutions

To make this gluten-free, swap the all-purpose flour for a 1-to-1 gluten-free flour blend and add 1/4 teaspoon xanthan gum if your blend lacks binding agents. Replace cheddar with mozzarella for a milder flavor, or feta for tang. For dairy-free, use a dairy-free shredded cheese and omit bacon or use plant-based bacon. Swap olive oil for melted butter for a richer flavor, though butter may brown the edges faster in the oven.

Serving Suggestions

Serve warm with a simple green salad and a lemony vinaigrette for contrast, or alongside tomato soup for a comforting lunch. Garnish with chopped chives, parsley, or a dollop of Greek yogurt. For brunch, place slices on a platter with smoked salmon and capers. Cut into small squares and offer with dipping sauces for party platters — a herbed aioli pairs particularly well.

Cultural Background

Salt-of-the-earth slices like this are common in Australian home cooking, often labeled as a "zucchini slice." They reflect a tradition of economical bakes that use seasonal produce and simple pantry items to create shareable dishes. The concept is similar to savory loaves and crustless quiches found across many cuisines, adapted to local produce and tastes in Australia and New Zealand.

Seasonal Adaptations

Summer zucchini is perfect here, but in cooler months swap in grated pumpkin or cooked, drained sweet potato for a fall twist. Add roasted red peppers and smoked paprika for a smoky variation, or include spring herbs like dill and chives with peas in spring for a brighter, herbal note. Holiday versions can include sun-dried tomatoes and a sprinkle of pine nuts for texture.

Meal Prep Tips

Make two pans at once and freeze one for quick meals later. Portion into individual servings to speed up weekday breakfasts — they reheat in minutes. Pre-grate zucchini and carrots and keep in sealed containers in the fridge for up to 48 hours, then assemble and bake when convenient. Label frozen portions with date and reheating instructions to keep things organized.

Whether you stick to the original bacon-and-cheddar approach or adapt it to be vegetarian or gluten-free, this zucchini slice is a reliable, flavorful, and homey dish that I turn to every season. It invites personalization and rewards small techniques like draining the zucchini and shredding cheese fresh. I hope it becomes as treasured in your kitchen as it is in mine.