Thunder claps and lightning strikes greet the bakers, but when the storms pass, a rainbow appears and inspires the final challenge of rainbow cakes; Valerie Bertinelli and Duff Goldman want cakes that have rainbows on the inside and outside.

Valerie Bertinelli and Duff Goldman love birthday parties at the park so they take their inspiration to the Big Bake Challenge; the kid bakers are tasked with creating bite-sized birthday party desserts for an outdoor birthday party.

Darci Lynne, a 13-year-old singing ventriloquist, and her puppet, Petunia, hang out at the ballpark with Valerie Bertinelli and Duff Goldman while they enjoy their favorite stadium snack of all -- popcorn.

Valerie Bertinelli and Duff Goldman love Italian food so much they challenge the bakers to create lasagna dessert imposters; the bakers must create meat lasagna, spinach-and-mushroom lasagna or veggie-pesto lasagna imposters.

In a moment of serendipity, Duff Goldman and Valerie Bertinelli create an ice cream sandwich with a doughnut; they ask the kid bakers to turn unexpected baked items like waffles, blondies and cupcakes into outrageous ice cream sandwiches.

Duff Goldman and Valerie Bertinelli challenge the kid bakers to make magic by creating a cake with a gravity-defying illusion on it.

A new group of kid bakers introduce themselves via delicious "selfieclairs"; using a selfie as inspiration, the bakers create eclairs in assigned flavors and then decorate them to serve as a pate a choux pastry introduction.

Valerie Bertinelli and Duff Goldman host the ultimate bake sale for the finale; they challenge the remaining three bakers to create cakes using bake sale items like toffee or rice cereal treats with a bake sale theme.

An insider's look at the sugar cookie puzzles that won these kid bakers a coveted spot in the competition.

An insider's look at the baked goods that won these bakers a coveted spot in the competition.

Serving up even more fun, delicious baking tips and tricks to try at home; an insider's look at the masterful baked goods that got these kid bakers a coveted spot in the competition.

Serving up even more fun, delicious baking tips and tricks to try at home; an insider's look at the masterful baked goods that got these kid bakers a coveted spot in the competition.

Serving up even more fun, delicious baking tips and tricks to try at home; an insider's look at the masterful baked goods that got these kid bakers a coveted spot in the competition.

An insider's look at the masterful baked goods that got these kid bakers a coveted spot in the competition.

An insider's look at the masterful baked goods that got these kid bakers a coveted spot in the competition.

Even more fun, delicious baking tips and tricks to try at home; an insider's look at the masterful baked goods that got these kid bakers a coveted spot in the competition.

Even more fun, delicious baking tips and tricks to try at home; an insider's look at the masterful baked goods that got these kid bakers a coveted spot in the competition.

It's always a puzzle to determine which three bakers will make it to the finale; this time, Valerie Bertinelli and Duff Goldman make it a sugar cookie puzzle.

Macarons are a wildly popular dessert, and macarons decorated with faces are a definite trend; Valerie Bertinelli and Duff Goldman challenge the nine young bakers to create macarons decorated with happy faces and sad faces.

The 10 young bakers are split into teams for the brownies vs. blondies challenge.

The young bakers are challenged to create mini cheesecakes with colorful animal prints, from tiger and zebra stripes, to leopard and giraffe spots.

Some of America's best bakers get set to prove their skills in this springtime baking championship.

The country's top bakers battle it out to create Halloween's spookiest and most irresistible treats.

America's top bakers gather to put their baking brilliance to the test.

Chefs mentor amateur cooks in an attempt to transform them from kitchen zeros to kitchen heroes.

Five teams of cake decorators, candy makers and pumpkin carvers compete.