One-Pan Lemon Blueberry Oatmeal Cake

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

A moist and tender oatmeal cake swirled with fresh blueberries and bright lemon, perfect for a simple dessert or breakfast treat. This american-inspired desserts ready in about 55 minutes pairs rolled oats, all-purpose flour, baking powder for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 200 calories and feeds 8, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart.

★ 4.4 (8 ratings) Prep: 15 min Cook: 40 min Serves 8 American cuisine 200 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat oven to 350°F (175°C). Grease a 9-inch round baking pan.
  2. Step 2: Whisk together 1 cup rolled oats, 1 cup all-purpose flour, 1 tsp baking powder, and 1/4 tsp salt in a large bowl.
  3. Step 3: Beat 1/2 cup honey, 1/2 cup vegetable oil, 1 large egg, 2 tbsp fresh lemon juice, and 1 tbsp lemon zest in another bowl until smooth.
  4. Step 4: Add wet ingredients to dry ingredients and stir until just combined.
  5. Step 5: Gently fold in 1 cup fresh blueberries.
  6. Step 6: Pour batter into prepared pan and smooth the top.
  7. Step 7: Bake for 35-40 minutes until a toothpick inserted comes out clean.
  8. Step 8: Cool in pan for 15 minutes, then dust with 2 tbsp powdered sugar before serving.

Frequently asked questions

How long does One-Pan Lemon Blueberry Oatmeal Cake take to make?

Total time is about 55 minutes (15 min prep + 40 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover One-Pan Lemon Blueberry Oatmeal Cake?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep rolled oats from drying out.

Can I substitute ingredients in One-Pan Lemon Blueberry Oatmeal Cake?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale One-Pan Lemon Blueberry Oatmeal Cake for a different number of people?

The recipe is written for 8 servings. Multiply each ingredient by (your serving target / 8). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with One-Pan Lemon Blueberry Oatmeal Cake?

American desserts like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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