This “dump-and-bake” blueberry casserole is the kind of recipe that surprises people with how something so simple can taste so comforting and rich. It uses frozen raw blueberries straight from the freezer, minimal prep, and just a few pantry staples to create a warm, jammy dessert-like bake that works for breakfast, brunch, or a cozy sweet treat after dinner.

Below is a clear, step-by-step guide to making it from start to finish.

🍇 Easy Frozen Blueberry Dump Casserole (3–4 Ingredients)

⭐ Why this recipe works

• No thawing required for blueberries
• Everything mixes directly in the baking dish (less cleanup)
• The berries turn into a naturally sweet, syrupy sauce as they bake
• Simple ingredients, big flavor payoff

🧾 Ingredients (Basic Version)

You only need a few simple ingredients:

• 3 to 4 cups frozen raw blueberries
• 1/2 to 3/4 cup granulated sugar (adjust to taste)
• 2 tablespoons cornstarch (helps thicken the juices)
• 1 teaspoon vanilla extract (optional but recommended)

Optional topping ideas:

• Crumble topping (butter + flour + sugar)
• Rolled oats for a rustic texture
• A pinch of cinnamon or lemon zest

👩‍🍳 Step-by-Step Method

1. Preheat the oven

Set your oven to 180°C (350°F).
This ensures even baking and helps the berries release their juices properly.

2. Prepare the baking dish

Use a medium-sized casserole dish (glass or ceramic works best).

No need to grease it heavily, but a light spray or thin layer of butter can help with cleanup.

3. Add the frozen blueberries

Pour the frozen blueberries directly into the dish.

👉 Important: Do NOT thaw them.
Frozen berries actually help create the syrupy sauce as they bake.

Spread them evenly across the dish.

4. Add sugar and cornstarch

Sprinkle the sugar evenly over the blueberries.

Then add the cornstarch and gently mix everything right in the dish.

• The sugar starts drawing out juice from the berries
• The cornstarch will thicken it into a jam-like consistency while baking

If using vanilla, drizzle it over now.

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