Add the wet ingredients to the dry ingredients and stir until just combined. Spoon the batter into the prepared pan.
In a small bowl, mix together the first 3 ingredients for the streusel. Stir in the oil until the mixture looks like wet sand. Sprinkle the streusel on top of the batter.
1/4 cup (30g) all-purpose flour, 1/4 cup (50g) sugar, 1/2 tsp ground cinnamon, 1 & 1/2 Tbsp vegetable oil
Bake for 60-70 minutes or until a toothpick inserted into the center comes out clean.
Notes
Leftovers can be tightly wrapped or stored in an airtight container for up to 3-5 days at room temperature.
How to freeze:
If you are planning to freeze this banana bread then omit the streusel or else it will get soggy when defrosting. Once completely cooled, tightly double wrap in saran wrap and place in a large freezer ziplock bag. Label and date and store in the freezer for up to 3 months.
Optional add-ins:
1/2 cup chopped walnuts or pecans
skip the streusel and add 1 cup chocolate chips
1/2 cup unsweetened shredded coconut
1 cup fresh blueberries
1/2 cup quick rolled oats and no streusel for a healthier option