Use Fresh or Frozen Blueberries: Fresh blueberries hold their shape best. If using frozen, add them straight from the freezer to avoid excess bleeding or watery batter.
Grease the Pan Well: Use butter, oil, or parchment paper to prevent sticking and make cleanup easier.
Let It Cool Before Slicing: Allow the baked oatmeal to cool for at least 10 minutes before cutting. This helps it firm up and hold its shape.
Customize the Sweetness: Taste the batter before baking and adjust the honey to your preference, especially if your blueberries are very sweet or tart.
Make It Ahead: Mix the ingredients the night before, refrigerate the unbaked dish, and bake in the morning. You may need to add 5–10 minutes to the bake time.