Preheat your oven to 375°F and grease a standard 12-cup muffin tin with butter or cooking spray. While the oven heats, hull and dice the strawberries into small ¼-inch pieces—keeping them uniform helps them distribute evenly throughout the batter. Zest the lemon and set aside. This prep work ensures everything is ready when you need it and prevents the batter from sitting too long after mixing.

In a large mixing bowl, whisk together the flour, oats, baking powder, baking soda, salt, and cinnamon until evenly distributed. This combines the leavening agents thoroughly so the muffins rise evenly and have a tender crumb structure ideal for toddler-friendly texture.

In a separate bowl, melt the butter gently (you can do this in a microwave in 30-second intervals), then whisk in the milk, maple syrup, eggs, and vanilla until smooth and combined. The melted butter helps everything emulsify together nicely. For toddler muffins, I prefer maple syrup over refined sugar because it dissolves smoothly and adds a subtle, natural sweetness that pairs beautifully with strawberries.

Pour the wet ingredient mixture from Step 3 into the dry mixture from Step 2 and stir until just combined—don't overmix, as this can lead to tough, dense muffins. Fold in the diced strawberries and lemon zest gently at the end. The slight lumpiness in the batter is exactly what you want for tender, moist muffins.

Divide the batter evenly among the muffin cups, filling each about three-quarters full (roughly ¼ cup per cup). Bake in the preheated 375°F oven for 16–18 minutes, until a toothpick inserted into a muffin comes out with just a few moist crumbs. The tops should be lightly golden brown. I find that room-temperature eggs and milk really do make a difference in how evenly these bake.

Let the muffins cool in the pan for 5 minutes so they set slightly, then turn them out onto a cooling rack. These are perfect warm, at room temperature, or even chilled for little hands to grab. They'll keep for 2–3 days in an airtight container.