Blueberry Oat Crumb Bars (Print Version)

# Ingredients:

→ Crumble & Base

01 - 1 large egg yolk
02 - 1/4 cup dark brown sugar
03 - 1/4 teaspoon sea salt
04 - 1/2 cup melted unsalted butter
05 - 3/4 cup old-fashioned oats
06 - 1/2 teaspoon powdered cinnamon
07 - 1 tablespoon extra dark brown sugar
08 - 1 cup all-purpose flour
09 - 1/2 cup granulated sugar

→ Berry Layer

10 - 1/4 cup granulated sugar
11 - 2 teaspoons starch (cornstarch)
12 - 2 cups blueberries (use fresh or thawed frozen ones)
13 - 2 tablespoons fresh-squeezed lemon juice

# Instructions:

01 - Set your oven to 350°F and let it preheat. Use butter to grease an 8x8 pan that's been lined with foil.
02 - Combine the oats, sugars, salt, flour, and cinnamon. Stir in egg yolk and melted butter.
03 - Set aside 1 cup of the mixture to use later. Push the rest firmly down into the pan you prepped.
04 - Combine blueberries, cornstarch, sugar, and lemon juice in a bowl. Spread it evenly over the crust base.
05 - Sprinkle a little extra brown sugar into the reserved mix. Then crumble it all over the blueberries.
06 - Bake until the edges are golden and the topping looks bubbly, about 40-45 minutes. Let it cool completely (at least 3 hours) before slicing.

# Notes:

01 - Skip quick or instant oats for this recipe
02 - Frozen blueberries take 10-15 extra minutes
03 - For easy cutting, wait until it's fully cool