Preheat the oven to 375°F. Grease a 9x13 glass baking dish. If you don't have a glass dish, use a standard brownie pan and preheat the oven to 350°F.
Using a stand mixer, beat together the brown sugar, white sugar, butter, and eggs, adding the eggs one at a time.
In a separate bowl, whisk together the flour, salt, and baking soda. Gradually add these dry ingredients to the creamed sugar and butter mixture. Mix until a sticky dough forms. Continue adding the rest of the flour until fully combined.
Spread the dough along the bottom of the greased glass baking dish. Aim for a thickness of about a half-inch to one inch, and make sure it's evenly spread.
Bake the blondies for 25-30 minutes or until they turn golden brown and start to crack on the top. Remove them from the oven and let them cool.
If decorating, drizzle the assorted colored candy melts across the top of the blondies. If you're cutting them into shapes, wait until they've completely cooled. Remove sections from the pan and cut into your desired shapes.
Serve warm or at room temperature. Have a wonderful Easter!