Heat the oven at 350°F; place the cupcake liners on a regular size cupcake pan. With an electric mixer add the mashed avocado to a large bowl and the milk; mix together, when ready. Stir in eggs and cake mix. Beat until getting a smooth and consistent cake batter. Spoon the preparation in each cupcake liners and bake until golden brown for about 20-30 minutes. Remove from oven and place in a wire rack until cold.