Preheat an oven to 350℉ (175℃). Line 40-48 muffin cups with paper liners (I only got about 40 cupcakes, but you may get more).
Whisk together the brownie mix, 2 eggs, ½ cup canola oil, and ¼ cup water in a bowl. Stir just until fully incorporated, about 50 strokes; set aside.
Mix the cake mix, ½ cup oil, 1 cup water, and 3 eggs in a large bowl with an electric mixer on low speed until combined. Mix on medium speed for 2 minutes.
Spoon the brownie batter into prepared muffin cups, filling each cup ⅓ full. Spoon the cake batter over the brownie batter, until muffin cups are each ⅔ full.
Bake in the preheated oven until golden and the tops spring back when lightly pressed, about 20 minutes.
Cool completely.
Frosting Instructions
Cream together the butter shortening, and vanilla.
Then add in milk and powdered sugar 1 cup at a time. Mix until light and fluffy.
Top with optional sprinkles.
Notes
Mix brownies and strawberry cake mix according to package directions. Your ingredients may vary slightly depending on what brand of mix you purchased.You only want to mix until everything is just combined. Do NOT overmix the batter. Also if your cake mix and brownie mix ingredients are different on the box, use the amounts on the box.