01 - Preheat oven to 350°F. Grease and flour an 8-inch square baking pan.
02 - In a large bowl, beat butter and sugar until light and fluffy. Incorporate eggs one at a time, mixing thoroughly after each addition.
03 - Blend in vanilla extract. Alternate adding flour, baking powder, baking soda, and salt with cream soda, stirring until just combined.
04 - Gently fold shredded cheddar cheese and crushed pretzels into batter.
05 - Pour mixture into prepared pan and bake for 25 to 30 minutes, or until a toothpick inserted in the center comes out clean. Cool completely.
06 - Beat softened butter until creamy. Gradually blend in powdered sugar, cream soda, and vanilla extract, beating until smooth.
07 - Crumble cooled cake into a bowl. Add 1 cup frosting and mix until cohesive; add more frosting if required for binding.
08 - Roll mixture into 1.5-inch balls, portioning with a scoop or spoon. Place on parchment-lined baking sheet and freeze for 20 minutes.
09 - Melt chocolate and candy melts in separate bowls using microwave or double boiler.
10 - Dip each ball into melted chocolate or colored melts. Allow excess to drip off and set on parchment paper.
11 - Apply candy eyes and sprinkle extra crushed pretzels onto wet coatings for monster effect.
12 - Chill until coatings are firm. Serve at room temperature.