Preheat oven to 400 degrees. Line a 12-cup muffin tin with unbleached parchment liners.
Combine the dry ingredients in a large mixing bowl. In a separate bowl or in a blender, whisk together the eggs, milk, melted butter, vanilla, and maple syrup. Pour into the dry mixture and stir until just combined. Gently fold in the blueberries.
Streusel topping – combine butter and flour in a small bowl mash together with a fork to combine. Add sugar, oats, and seeds to butter-flour mixture. Stir together honey and water and add to mixture. Combine well.
Divide the batter among the muffin liners, sprinkle each with streusel topping and bake 22-30 minutes or until a toothpick inserted into the center of a muffin comes out clean. Cool on a rack.